diff --git a/dumux/porousmediumflow/1pnc/vtkoutputfields.hh b/dumux/porousmediumflow/1pnc/vtkoutputfields.hh
index bdfbce9d64912df30c371bf835d99aa902bf5636..c2b3b3b1a3235488164d54b4f36049b9e1fd94dc 100644
--- a/dumux/porousmediumflow/1pnc/vtkoutputfields.hh
+++ b/dumux/porousmediumflow/1pnc/vtkoutputfields.hh
@@ -49,11 +49,11 @@ public:
 
         for (int i = 0; i < VolumeVariables::numComponents(); ++i)
            vtk.addVolumeVariable([i](const auto& volVars){ return volVars.moleFraction(Indices::fluidSystemPhaseIdx, i); },
-                                     "x_" + std::string(FluidSystem::componentName(i)));
+                                     "x^" + std::string(FluidSystem::componentName(i)) + "_" + std::string(FluidSystem::phaseName(Indices::fluidSystemPhaseIdx)));
 
         for (int i = 0; i < VolumeVariables::numComponents(); ++i)
            vtk.addVolumeVariable([i](const auto& volVars){ return volVars.massFraction(Indices::fluidSystemPhaseIdx, i); },
-                                     "X_" + std::string(FluidSystem::componentName(i)));
+                                     "X^" + std::string(FluidSystem::componentName(i))+ "_" + std::string(FluidSystem::phaseName(Indices::fluidSystemPhaseIdx)));
     }
 };
 
diff --git a/dumux/porousmediumflow/2p/vtkoutputfields.hh b/dumux/porousmediumflow/2p/vtkoutputfields.hh
index fea024af3354a45691583e913bb70bdaece70b0c..281333441fdce55a652380c7e5538e80d47d8fa5 100644
--- a/dumux/porousmediumflow/2p/vtkoutputfields.hh
+++ b/dumux/porousmediumflow/2p/vtkoutputfields.hh
@@ -42,15 +42,15 @@ public:
         vtk.addVolumeVariable([](const VolumeVariables& v){ return v.porosity(); }, "porosity");
         vtk.addVolumeVariable([](const VolumeVariables& v){ return v.capillaryPressure(); }, "pc");
 
-        vtk.addVolumeVariable([](const VolumeVariables& v){ return v.saturation(FS::phase0Idx); }, "Sw");
-        vtk.addVolumeVariable([](const VolumeVariables& v){ return v.pressure(FS::phase0Idx); }, "pw");
-        vtk.addVolumeVariable([](const VolumeVariables& v){ return v.density(FS::phase0Idx); }, "rhoW");
-        vtk.addVolumeVariable([](const VolumeVariables& v){ return v.mobility(FS::phase0Idx); }, "mobW");
+        vtk.addVolumeVariable([](const VolumeVariables& v){ return v.saturation(FS::phase0Idx); }, "S_w");
+        vtk.addVolumeVariable([](const VolumeVariables& v){ return v.pressure(FS::phase0Idx); }, "p_w");
+        vtk.addVolumeVariable([](const VolumeVariables& v){ return v.density(FS::phase0Idx); }, "rho_w");
+        vtk.addVolumeVariable([](const VolumeVariables& v){ return v.mobility(FS::phase0Idx); }, "mob_w");
 
-        vtk.addVolumeVariable([](const VolumeVariables& v){ return v.saturation(FS::phase1Idx); }, "Sn");
-        vtk.addVolumeVariable([](const VolumeVariables& v){ return v.pressure(FS::phase1Idx); }, "pn");
-        vtk.addVolumeVariable([](const VolumeVariables& v){ return v.density(FS::phase1Idx); }, "rhoN");
-        vtk.addVolumeVariable([](const VolumeVariables& v){ return v.mobility(FS::phase1Idx); }, "mobN");
+        vtk.addVolumeVariable([](const VolumeVariables& v){ return v.saturation(FS::phase1Idx); }, "S_n");
+        vtk.addVolumeVariable([](const VolumeVariables& v){ return v.pressure(FS::phase1Idx); }, "p_n");
+        vtk.addVolumeVariable([](const VolumeVariables& v){ return v.density(FS::phase1Idx); }, "rho_n");
+        vtk.addVolumeVariable([](const VolumeVariables& v){ return v.mobility(FS::phase1Idx); }, "mob_n");
     }
 };
 
diff --git a/dumux/porousmediumflow/2p2c/vtkoutputfields.hh b/dumux/porousmediumflow/2p2c/vtkoutputfields.hh
index c947f2a3f968d05d10d4b7ef9f7c7cd2d959e9d3..d3a15b5b3c31ea765e8f02affd9342bdca7e8f37 100644
--- a/dumux/porousmediumflow/2p2c/vtkoutputfields.hh
+++ b/dumux/porousmediumflow/2p2c/vtkoutputfields.hh
@@ -40,23 +40,23 @@ public:
         using FluidSystem = typename VolumeVariables::FluidSystem;
 
         // register standardized vtk output fields
-        vtk.addVolumeVariable([](const auto& v){ return v.saturation(FluidSystem::phase1Idx); }, "Sn");
-        vtk.addVolumeVariable([](const auto& v){ return v.saturation(FluidSystem::phase0Idx); }, "Sw");
-        vtk.addVolumeVariable([](const auto& v){ return v.pressure(FluidSystem::phase1Idx); }, "pn");
-        vtk.addVolumeVariable([](const auto& v){ return v.pressure(FluidSystem::phase0Idx); }, "pw");
+        vtk.addVolumeVariable([](const auto& v){ return v.saturation(FluidSystem::phase1Idx); }, "S_n");
+        vtk.addVolumeVariable([](const auto& v){ return v.saturation(FluidSystem::phase0Idx); }, "S_w");
+        vtk.addVolumeVariable([](const auto& v){ return v.pressure(FluidSystem::phase1Idx); }, "p_n");
+        vtk.addVolumeVariable([](const auto& v){ return v.pressure(FluidSystem::phase0Idx); }, "p_w");
         vtk.addVolumeVariable([](const auto& v){ return v.capillaryPressure(); }, "pc");
-        vtk.addVolumeVariable([](const auto& v){ return v.density(FluidSystem::phase0Idx); }, "rhoW");
-        vtk.addVolumeVariable([](const auto& v){ return v.density(FluidSystem::phase1Idx); }, "rhoN");
-        vtk.addVolumeVariable([](const auto& v){ return v.mobility(FluidSystem::phase0Idx); }, "mobW");
-        vtk.addVolumeVariable([](const auto& v){ return v.mobility(FluidSystem::phase1Idx); }, "mobN");
+        vtk.addVolumeVariable([](const auto& v){ return v.density(FluidSystem::phase0Idx); }, "rho_w");
+        vtk.addVolumeVariable([](const auto& v){ return v.density(FluidSystem::phase1Idx); }, "rho_n");
+        vtk.addVolumeVariable([](const auto& v){ return v.mobility(FluidSystem::phase0Idx); }, "mob_w");
+        vtk.addVolumeVariable([](const auto& v){ return v.mobility(FluidSystem::phase1Idx); }, "mob_n");
 
         for (int i = 0; i < VolumeVariables::numPhases(); ++i)
             for (int j = 0; j < VolumeVariables::numComponents(); ++j)
-                vtk.addVolumeVariable([i,j](const auto& v){ return v.massFraction(i,j); },"X_"+ FluidSystem::phaseName(i) + "^" + FluidSystem::componentName(j));
+                vtk.addVolumeVariable([i,j](const auto& v){ return v.massFraction(i,j); },"X^"+ FluidSystem::componentName(j) + "_" + FluidSystem::phaseName(i));
 
         for (int i = 0; i < VolumeVariables::numPhases(); ++i)
             for (int j = 0; j < VolumeVariables::numComponents(); ++j)
-                vtk.addVolumeVariable([i,j](const auto& v){ return v.moleFraction(i,j); },"x_"+ FluidSystem::phaseName(i) + "^" + FluidSystem::componentName(j));
+                vtk.addVolumeVariable([i,j](const auto& v){ return v.moleFraction(i,j); },"x^"+ FluidSystem::componentName(j) + "_" + FluidSystem::phaseName(i));
 
         vtk.addVolumeVariable([](const auto& v){ return v.porosity(); }, "porosity");
         vtk.addVolumeVariable([](const auto& v){ return v.priVars().state(); }, "phase presence");
diff --git a/dumux/porousmediumflow/2pnc/vtkoutputfields.hh b/dumux/porousmediumflow/2pnc/vtkoutputfields.hh
index c39ab91536a13fb53fc66cd822961d7c1378dd5a..1d103425f949584b51253446a725efc9ba395549 100644
--- a/dumux/porousmediumflow/2pnc/vtkoutputfields.hh
+++ b/dumux/porousmediumflow/2pnc/vtkoutputfields.hh
@@ -49,11 +49,11 @@ public:
         for (int i = 0; i < VolumeVariables::numPhases(); ++i)
             for (int j = 0; j < VolumeVariables::numComponents(); ++j)
                 vtk.addVolumeVariable([i,j](const auto& v){ return v.moleFraction(i,j); },
-                                      "x_"+ FluidSystem::phaseName(i) + "^" + FluidSystem::componentName(j));
+                                      "x^"+ FluidSystem::componentName(j) + "_" + FluidSystem::phaseName(i));
 
         for (int j = 0; j < VolumeVariables::numComponents(); ++j)
             vtk.addVolumeVariable([j](const auto& v){ return v.molarity(FluidSystem::phase0Idx,j); },
-                                  "m_"+ FluidSystem::phaseName(FluidSystem::phase0Idx) + "^" + FluidSystem::componentName(j));
+                                  "m^" + FluidSystem::componentName(j) + "_" + FluidSystem::phaseName(FluidSystem::phase0Idx));
 
         vtk.addVolumeVariable([](const auto& v){ return v.priVars().state(); }, "phasePresence");
     }
diff --git a/dumux/porousmediumflow/3p/vtkoutputfields.hh b/dumux/porousmediumflow/3p/vtkoutputfields.hh
index 8fb983196a0a4d381bb6781a2cc6a95ca7a25d90..74f96a023196f6aa29a526dfed5f6237365a31b7 100644
--- a/dumux/porousmediumflow/3p/vtkoutputfields.hh
+++ b/dumux/porousmediumflow/3p/vtkoutputfields.hh
@@ -39,15 +39,15 @@ public:
         using FluidSystem = typename VtkOutputModule::VolumeVariables::FluidSystem;
 
         // register standardized vtk output fields
-        vtk.addVolumeVariable( [](const auto& v){ return v.saturation(FluidSystem::wPhaseIdx); }, "sw");
-        vtk.addVolumeVariable( [](const auto& v){ return v.saturation(FluidSystem::nPhaseIdx); },"sn");
-        vtk.addVolumeVariable( [](const auto& v){ return v.saturation(FluidSystem::gPhaseIdx); },"sg");
-        vtk.addVolumeVariable( [](const auto& v){ return v.pressure(FluidSystem::wPhaseIdx); },"pw");
-        vtk.addVolumeVariable( [](const auto& v){ return v.pressure(FluidSystem::nPhaseIdx); },"pn");
-        vtk.addVolumeVariable( [](const auto& v){ return v.pressure(FluidSystem::gPhaseIdx); },"pg");
-        vtk.addVolumeVariable( [](const auto& v){ return v.density(FluidSystem::wPhaseIdx); },"rhow");
-        vtk.addVolumeVariable( [](const auto& v){ return v.density(FluidSystem::nPhaseIdx); },"rhon");
-        vtk.addVolumeVariable( [](const auto& v){ return v.density(FluidSystem::gPhaseIdx); },"rhog");
+        vtk.addVolumeVariable( [](const auto& v){ return v.saturation(FluidSystem::wPhaseIdx); }, "S_w");
+        vtk.addVolumeVariable( [](const auto& v){ return v.saturation(FluidSystem::nPhaseIdx); },"S_n");
+        vtk.addVolumeVariable( [](const auto& v){ return v.saturation(FluidSystem::gPhaseIdx); },"S_g");
+        vtk.addVolumeVariable( [](const auto& v){ return v.pressure(FluidSystem::wPhaseIdx); },"p_w");
+        vtk.addVolumeVariable( [](const auto& v){ return v.pressure(FluidSystem::nPhaseIdx); },"p_n");
+        vtk.addVolumeVariable( [](const auto& v){ return v.pressure(FluidSystem::gPhaseIdx); },"p_g");
+        vtk.addVolumeVariable( [](const auto& v){ return v.density(FluidSystem::wPhaseIdx); },"rho_w");
+        vtk.addVolumeVariable( [](const auto& v){ return v.density(FluidSystem::nPhaseIdx); },"rho_n");
+        vtk.addVolumeVariable( [](const auto& v){ return v.density(FluidSystem::gPhaseIdx); },"rho_g");
         vtk.addVolumeVariable( [](const auto& v){ return v.porosity(); },"porosity");
         vtk.addVolumeVariable( [](const auto& v){ return v.permeability(); },"permeability");
     }
diff --git a/dumux/porousmediumflow/3p3c/vtkoutputfields.hh b/dumux/porousmediumflow/3p3c/vtkoutputfields.hh
index d8d4c37b45f62e8ef3f9fca5e61716042a96d374..ed996a98e0f295018af1b150722fdbbcd12fad92 100644
--- a/dumux/porousmediumflow/3p3c/vtkoutputfields.hh
+++ b/dumux/porousmediumflow/3p3c/vtkoutputfields.hh
@@ -40,15 +40,15 @@ public:
         using FluidSystem = typename VolumeVariables::FluidSystem;
 
         // register standardized vtk output fields
-        vtk.addVolumeVariable( [](const auto& v){ return v.saturation(FluidSystem::wPhaseIdx); }, "Sw");
-        vtk.addVolumeVariable( [](const auto& v){ return v.saturation(FluidSystem::nPhaseIdx); },"Sn");
-        vtk.addVolumeVariable( [](const auto& v){ return v.saturation(FluidSystem::gPhaseIdx); },"Sg");
-        vtk.addVolumeVariable( [](const auto& v){ return v.pressure(FluidSystem::wPhaseIdx); },"pw");
-        vtk.addVolumeVariable( [](const auto& v){ return v.pressure(FluidSystem::nPhaseIdx); },"pn");
-        vtk.addVolumeVariable( [](const auto& v){ return v.pressure(FluidSystem::gPhaseIdx); },"pg");
-        vtk.addVolumeVariable( [](const auto& v){ return v.density(FluidSystem::wPhaseIdx); },"rhow");
-        vtk.addVolumeVariable( [](const auto& v){ return v.density(FluidSystem::nPhaseIdx); },"rhon");
-        vtk.addVolumeVariable( [](const auto& v){ return v.density(FluidSystem::gPhaseIdx); },"rhog");
+        vtk.addVolumeVariable( [](const auto& v){ return v.saturation(FluidSystem::wPhaseIdx); }, "S_w");
+        vtk.addVolumeVariable( [](const auto& v){ return v.saturation(FluidSystem::nPhaseIdx); },"S_n");
+        vtk.addVolumeVariable( [](const auto& v){ return v.saturation(FluidSystem::gPhaseIdx); },"S_g");
+        vtk.addVolumeVariable( [](const auto& v){ return v.pressure(FluidSystem::wPhaseIdx); },"p_w");
+        vtk.addVolumeVariable( [](const auto& v){ return v.pressure(FluidSystem::nPhaseIdx); },"p_n");
+        vtk.addVolumeVariable( [](const auto& v){ return v.pressure(FluidSystem::gPhaseIdx); },"p_g");
+        vtk.addVolumeVariable( [](const auto& v){ return v.density(FluidSystem::wPhaseIdx); },"rho_w");
+        vtk.addVolumeVariable( [](const auto& v){ return v.density(FluidSystem::nPhaseIdx); },"rho_n");
+        vtk.addVolumeVariable( [](const auto& v){ return v.density(FluidSystem::gPhaseIdx); },"rho_g");
 
         for (int i = 0; i < VolumeVariables::numPhases(); ++i)
             for (int j = 0; j < VolumeVariables::numComponents(); ++j)
diff --git a/dumux/porousmediumflow/3pwateroil/vtkoutputfields.hh b/dumux/porousmediumflow/3pwateroil/vtkoutputfields.hh
index eb3719d7a8f4465996da5cb0e2868ecdc10c1520..df921d7e70363211ffddef51d1926607c3eeee02 100644
--- a/dumux/porousmediumflow/3pwateroil/vtkoutputfields.hh
+++ b/dumux/porousmediumflow/3pwateroil/vtkoutputfields.hh
@@ -41,28 +41,26 @@ public:
         using FluidSystem = typename VolumeVariables::FluidSystem;
 
         // register standardized vtk output fields
-        vtk.addVolumeVariable( [](const auto& v){ return v.saturation(FluidSystem::wPhaseIdx); }, "sw");
-        vtk.addVolumeVariable( [](const auto& v){ return v.saturation(FluidSystem::nPhaseIdx); },"sn");
-        vtk.addVolumeVariable( [](const auto& v){ return v.saturation(FluidSystem::gPhaseIdx); },"sg");
-        vtk.addVolumeVariable( [](const auto& v){ return v.pressure(FluidSystem::wPhaseIdx); },"pw");
-        vtk.addVolumeVariable( [](const auto& v){ return v.pressure(FluidSystem::nPhaseIdx); },"pn");
-        vtk.addVolumeVariable( [](const auto& v){ return v.pressure(FluidSystem::gPhaseIdx); },"pg");
-        vtk.addVolumeVariable( [](const auto& v){ return v.density(FluidSystem::wPhaseIdx); },"rhow");
-        vtk.addVolumeVariable( [](const auto& v){ return v.density(FluidSystem::nPhaseIdx); },"rhon");
-        vtk.addVolumeVariable( [](const auto& v){ return v.density(FluidSystem::gPhaseIdx); },"rhog");
-        vtk.addVolumeVariable( [](const auto& v){ return
-        v.mobility(FluidSystem::wPhaseIdx); },"MobW");
-        vtk.addVolumeVariable( [](const auto& v){ return v.mobility(FluidSystem::nPhaseIdx); },"MobN");
-        vtk.addVolumeVariable( [](const auto& v){ return v.mobility(FluidSystem::gPhaseIdx); },"MobG");
-        vtk.addVolumeVariable( [](const auto& v){ return
-        v.viscosity(FluidSystem::wPhaseIdx); },"ViscosW");
-        vtk.addVolumeVariable( [](const auto& v){ return v.viscosity(FluidSystem::nPhaseIdx); },"ViscosN");
-        vtk.addVolumeVariable( [](const auto& v){ return v.viscosity(FluidSystem::gPhaseIdx); },"ViscosG");
+        vtk.addVolumeVariable( [](const auto& v){ return v.saturation(FluidSystem::wPhaseIdx); }, "S_w");
+        vtk.addVolumeVariable( [](const auto& v){ return v.saturation(FluidSystem::nPhaseIdx); },"S_n");
+        vtk.addVolumeVariable( [](const auto& v){ return v.saturation(FluidSystem::gPhaseIdx); },"S_g");
+        vtk.addVolumeVariable( [](const auto& v){ return v.pressure(FluidSystem::wPhaseIdx); },"p_w");
+        vtk.addVolumeVariable( [](const auto& v){ return v.pressure(FluidSystem::nPhaseIdx); },"p_n");
+        vtk.addVolumeVariable( [](const auto& v){ return v.pressure(FluidSystem::gPhaseIdx); },"p_g");
+        vtk.addVolumeVariable( [](const auto& v){ return v.density(FluidSystem::wPhaseIdx); },"rho_w");
+        vtk.addVolumeVariable( [](const auto& v){ return v.density(FluidSystem::nPhaseIdx); },"rho_n");
+        vtk.addVolumeVariable( [](const auto& v){ return v.density(FluidSystem::gPhaseIdx); },"rho_g");
+        vtk.addVolumeVariable( [](const auto& v){ return v.mobility(FluidSystem::wPhaseIdx); },"mob_w");
+        vtk.addVolumeVariable( [](const auto& v){ return v.mobility(FluidSystem::nPhaseIdx); },"mob_n");
+        vtk.addVolumeVariable( [](const auto& v){ return v.mobility(FluidSystem::gPhaseIdx); },"mob_g");
+        vtk.addVolumeVariable( [](const auto& v){ return v.viscosity(FluidSystem::wPhaseIdx); },"viscos_w");
+        vtk.addVolumeVariable( [](const auto& v){ return v.viscosity(FluidSystem::nPhaseIdx); },"viscos_n");
+        vtk.addVolumeVariable( [](const auto& v){ return v.viscosity(FluidSystem::gPhaseIdx); },"viscos_g");
 
         for (int i = 0; i < VolumeVariables::numPhases(); ++i)
             for (int j = 0; j < VolumeVariables::numComponents(); ++j)
                 vtk.addVolumeVariable([i,j](const auto& v){ return v.moleFraction(i,j); },
-                                      "x^" + FluidSystem::phaseName(i) + "_" +  FluidSystem::componentName(j));
+                                      "x^" + FluidSystem::componentName(j) + "_" +  FluidSystem::phaseName(i));
 
         vtk.addVolumeVariable( [](const auto& v){ return v.porosity(); },"porosity");
         vtk.addVolumeVariable( [](const auto& v){ return v.priVars().state(); },"phase presence");
diff --git a/dumux/porousmediumflow/mineralization/vtkoutputfields.hh b/dumux/porousmediumflow/mineralization/vtkoutputfields.hh
index f07b5d9d4bd3f311a368ab9ad8b4b4ea43fb9320..fc482af544e471b723f8839e8a15f07059ab4806 100644
--- a/dumux/porousmediumflow/mineralization/vtkoutputfields.hh
+++ b/dumux/porousmediumflow/mineralization/vtkoutputfields.hh
@@ -46,7 +46,7 @@ public:
         // additional output
         for (int i = 0; i < SolidSystem::numComponents - SolidSystem::numInertComponents; ++i)
         {
-            vtk.addVolumeVariable([i](const auto& v){ return v.solidVolumeFraction(i); },"precipitateVolumeFraction_"+ SolidSystem::componentName(i));
+            vtk.addVolumeVariable([i](const auto& v){ return v.solidVolumeFraction(i); },"precipitateVolumeFraction^"+ SolidSystem::componentName(i));
         }
     }
 };
diff --git a/dumux/porousmediumflow/mpnc/vtkoutputfields.hh b/dumux/porousmediumflow/mpnc/vtkoutputfields.hh
index 3d229fed7c39fa67baa19741c63b1fd590f8c0d3..b62a0a634361939bb13ee3738672d613702aae6f 100644
--- a/dumux/porousmediumflow/mpnc/vtkoutputfields.hh
+++ b/dumux/porousmediumflow/mpnc/vtkoutputfields.hh
@@ -48,7 +48,7 @@ public:
             vtk.addVolumeVariable([i](const auto& v){ return v.mobility(i); },"lambda_"+ FluidSystem::phaseName(i));
 
             for (int j = 0; j < VolumeVariables::numComponents(); ++j)
-                vtk.addVolumeVariable([i,j](const auto& v){ return v.moleFraction(i,j); },"x_"+ FluidSystem::phaseName(i) + "^" + FluidSystem::componentName(j));
+                vtk.addVolumeVariable([i,j](const auto& v){ return v.moleFraction(i,j); },"x^"+ FluidSystem::componentName(j) + "_" + FluidSystem::phaseName(i));
         }
     }
 };
diff --git a/dumux/porousmediumflow/richards/vtkoutputfields.hh b/dumux/porousmediumflow/richards/vtkoutputfields.hh
index baf1139d791672d174141a6ab3f14a535097c88f..082ea7874e78251d11c1200cecd4c7f535376bfd 100644
--- a/dumux/porousmediumflow/richards/vtkoutputfields.hh
+++ b/dumux/porousmediumflow/richards/vtkoutputfields.hh
@@ -41,10 +41,10 @@ public:
     {
         using FluidSystem = typename VtkOutputModule::VolumeVariables::FluidSystem;
 
-        vtk.addVolumeVariable([](const auto& v){ return v.saturation(FluidSystem::liquidPhaseIdx); }, "Sw");
-        vtk.addVolumeVariable([](const auto& v){ return v.saturation(FluidSystem::gasPhaseIdx); }, "Sn");
-        vtk.addVolumeVariable([](const auto& v){ return v.pressure(FluidSystem::liquidPhaseIdx); }, "pw");
-        vtk.addVolumeVariable([](const auto& v){ return v.pressure(FluidSystem::gasPhaseIdx); }, "pn");
+        vtk.addVolumeVariable([](const auto& v){ return v.saturation(FluidSystem::liquidPhaseIdx); }, "S_w");
+        vtk.addVolumeVariable([](const auto& v){ return v.saturation(FluidSystem::gasPhaseIdx); }, "S_n");
+        vtk.addVolumeVariable([](const auto& v){ return v.pressure(FluidSystem::liquidPhaseIdx); }, "p_w");
+        vtk.addVolumeVariable([](const auto& v){ return v.pressure(FluidSystem::gasPhaseIdx); }, "p_n");
         vtk.addVolumeVariable([](const auto& v){ return v.capillaryPressure(); }, "pc");
         vtk.addVolumeVariable([](const auto& v){ return v.density(FluidSystem::liquidPhaseIdx); }, "density");
         vtk.addVolumeVariable([](const auto& v){ return v.mobility(FluidSystem::liquidPhaseIdx); }, "mobility");
@@ -56,7 +56,7 @@ public:
         if(gravity)
             vtk.addVolumeVariable([](const auto& v){ return v.pressureHead(FluidSystem::liquidPhaseIdx); }, "pressure head");
         if (enableWaterDiffusionInAir)
-            vtk.addVolumeVariable([](const auto& v){ return v.moleFraction(1, 0); }, "x^w_air");
+            vtk.addVolumeVariable([](const auto& v){ return v.moleFraction(1, 0); }, "x^air_w");
         vtk.addVolumeVariable([](const auto& v){ return v.waterContent(FluidSystem::liquidPhaseIdx); },"water content");
 
         vtk.addVolumeVariable([](const auto& v){ return v.priVars().state(); }, "phasePresence");
diff --git a/dumux/porousmediumflow/richardsnc/vtkoutputfields.hh b/dumux/porousmediumflow/richardsnc/vtkoutputfields.hh
index dbf43f0a00fa051be21924ced6a905231b45d7b3..d9f16161a37ed8f6863edc89a9d5251f2c0c5241 100644
--- a/dumux/porousmediumflow/richardsnc/vtkoutputfields.hh
+++ b/dumux/porousmediumflow/richardsnc/vtkoutputfields.hh
@@ -41,10 +41,10 @@ public:
         using VolumeVariables = typename VtkOutputModule::VolumeVariables;
         using FluidSystem = typename VolumeVariables::FluidSystem;
 
-        vtk.addVolumeVariable([](const auto& v){ return v.saturation(VolumeVariables::liquidPhaseIdx); }, "Sw");
-        vtk.addVolumeVariable([](const auto& v){ return v.saturation(VolumeVariables::gasPhaseIdx); }, "Sn");
-        vtk.addVolumeVariable([](const auto& v){ return v.pressure(VolumeVariables::liquidPhaseIdx); }, "pw");
-        vtk.addVolumeVariable([](const auto& v){ return v.pressure(VolumeVariables::gasPhaseIdx); }, "pn");
+        vtk.addVolumeVariable([](const auto& v){ return v.saturation(VolumeVariables::liquidPhaseIdx); }, "S_w");
+        vtk.addVolumeVariable([](const auto& v){ return v.saturation(VolumeVariables::gasPhaseIdx); }, "S_n");
+        vtk.addVolumeVariable([](const auto& v){ return v.pressure(VolumeVariables::liquidPhaseIdx); }, "p_w");
+        vtk.addVolumeVariable([](const auto& v){ return v.pressure(VolumeVariables::gasPhaseIdx); }, "p_n");
         vtk.addVolumeVariable([](const auto& v){ return v.capillaryPressure(); }, "pc");
         vtk.addVolumeVariable([](const auto& v){ return v.density(VolumeVariables::liquidPhaseIdx); }, "density");
         vtk.addVolumeVariable([](const auto& v){ return v.mobility(VolumeVariables::liquidPhaseIdx); }, "mobility");
@@ -59,7 +59,7 @@ public:
 
         for (int compIdx = 0; compIdx < VolumeVariables::numComponents(); ++compIdx)
             vtk.addVolumeVariable([compIdx](const auto& v){ return v.moleFraction(VolumeVariables::liquidPhaseIdx, compIdx); },
-                                  "x^" + FluidSystem::phaseName(VolumeVariables::liquidPhaseIdx) + "_" + FluidSystem::componentName(compIdx));
+                                  "x^" + FluidSystem::componentName(compIdx) + "_" + FluidSystem::phaseName(VolumeVariables::liquidPhaseIdx));
 
     }
 };
diff --git a/dumux/porousmediumflow/tracer/vtkoutputfields.hh b/dumux/porousmediumflow/tracer/vtkoutputfields.hh
index f8b3aa6c0d589cedb2226d26d5327a37a8474121..417b3d015a0deea0709f5595426524d885b96ba0 100644
--- a/dumux/porousmediumflow/tracer/vtkoutputfields.hh
+++ b/dumux/porousmediumflow/tracer/vtkoutputfields.hh
@@ -45,9 +45,9 @@ public:
         for (int compIdx = 0; compIdx < VolumeVariables::numComponents(); ++compIdx)
         {
             vtk.addVolumeVariable( [compIdx](const auto& v){  return v.moleFraction(0, compIdx); },
-                                   "x_" + std::string(FluidSystem::componentName(compIdx)));
+                                   "x^" + std::string(FluidSystem::componentName(compIdx)));
             vtk.addVolumeVariable( [compIdx](const auto& v){  return v.massFraction(0, compIdx); },
-                                   "X_" + std::string(FluidSystem::componentName(compIdx)));
+                                   "X^" + std::string(FluidSystem::componentName(compIdx)));
         }
         vtk.addVolumeVariable( [](const auto& v){ return v.density(); }, "rho");
     }
diff --git a/test/porousmediumflow/2p2c/implicit/mpnccomparison/vtkoutputfields.hh b/test/porousmediumflow/2p2c/implicit/mpnccomparison/vtkoutputfields.hh
index 038c4b4a814f47291f9b84850da206a32b85ae16..e161c32264bcb24472aa179715f8a42d1a7a4568 100644
--- a/test/porousmediumflow/2p2c/implicit/mpnccomparison/vtkoutputfields.hh
+++ b/test/porousmediumflow/2p2c/implicit/mpnccomparison/vtkoutputfields.hh
@@ -41,23 +41,23 @@ public:
 
         // register standardized vtk output fields
         vtk.addVolumeVariable([](const auto& v){ return v.porosity(); }, "porosity");
-        vtk.addVolumeVariable([](const auto& v){ return v.saturation(FluidSystem::phase1Idx); }, "Sn");
-        vtk.addVolumeVariable([](const auto& v){ return v.saturation(FluidSystem::phase0Idx); }, "Sw");
-        vtk.addVolumeVariable([](const auto& v){ return v.pressure(FluidSystem::phase1Idx); }, "pn");
-        vtk.addVolumeVariable([](const auto& v){ return v.pressure(FluidSystem::phase0Idx); }, "pw");
+        vtk.addVolumeVariable([](const auto& v){ return v.saturation(FluidSystem::phase1Idx); }, "S_n");
+        vtk.addVolumeVariable([](const auto& v){ return v.saturation(FluidSystem::phase0Idx); }, "S_w");
+        vtk.addVolumeVariable([](const auto& v){ return v.pressure(FluidSystem::phase1Idx); }, "p_n");
+        vtk.addVolumeVariable([](const auto& v){ return v.pressure(FluidSystem::phase0Idx); }, "p_w");
 
-        vtk.addVolumeVariable([](const auto& v){ return v.density(FluidSystem::phase0Idx); }, "rhoW");
-        vtk.addVolumeVariable([](const auto& v){ return v.density(FluidSystem::phase1Idx); }, "rhoN");
-        vtk.addVolumeVariable([](const auto& v){ return v.mobility(FluidSystem::phase0Idx); }, "mobW");
-        vtk.addVolumeVariable([](const auto& v){ return v.mobility(FluidSystem::phase1Idx); }, "mobN");
+        vtk.addVolumeVariable([](const auto& v){ return v.density(FluidSystem::phase0Idx); }, "rho_w");
+        vtk.addVolumeVariable([](const auto& v){ return v.density(FluidSystem::phase1Idx); }, "rho_n");
+        vtk.addVolumeVariable([](const auto& v){ return v.mobility(FluidSystem::phase0Idx); }, "mob_w");
+        vtk.addVolumeVariable([](const auto& v){ return v.mobility(FluidSystem::phase1Idx); }, "mob_n");
 
         for (int i = 0; i < VolumeVariables::numPhases(); ++i)
             for (int j = 0; j < VolumeVariables::numComponents(); ++j)
-                vtk.addVolumeVariable([i,j](const auto& v){ return v.massFraction(i,j); },"X_"+ FluidSystem::phaseName(i) + "^" + FluidSystem::componentName(j));
+                vtk.addVolumeVariable([i,j](const auto& v){ return v.massFraction(i,j); },"X^"+ FluidSystem::componentName(j) + "_" + FluidSystem::phaseName(i));
 
         for (int i = 0; i < VolumeVariables::numPhases(); ++i)
             for (int j = 0; j < VolumeVariables::numComponents(); ++j)
-                vtk.addVolumeVariable([i,j](const auto& v){ return v.moleFraction(i,j); },"x_"+ FluidSystem::phaseName(i) + "^" + FluidSystem::componentName(j));
+                vtk.addVolumeVariable([i,j](const auto& v){ return v.moleFraction(i,j); },"x^"+ FluidSystem::componentName(j) + "_" + FluidSystem::phaseName(i));
     }
 };
 
diff --git a/test/references/1p2cniboxconduction-reference.vtu b/test/references/1p2cniboxconduction-reference.vtu
index 14ea1dccbdc68a27ff52915b1b27285c72c63f88..7e9c6ab835c1fe348f71cb190753bf5d45e24a70 100644
--- a/test/references/1p2cniboxconduction-reference.vtu
+++ b/test/references/1p2cniboxconduction-reference.vtu
@@ -178,7 +178,7 @@
           8.81909e-11 -1.676e-19 0 8.81909e-11 -1.676e-19 0 8.81909e-11 6.70401e-19 0 8.81909e-11 6.70401e-19 0
           8.81909e-11 0 0 8.81909e-11 0 0
         </DataArray>
-        <DataArray type="Float32" Name="x_H2O" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="x^H2O_w" NumberOfComponents="1" format="ascii">
           0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999
           0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999
           0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999
@@ -214,7 +214,7 @@
           0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999
           0.99999 0.99999 0.99999 0.99999 0.99999 0.99999
         </DataArray>
-        <DataArray type="Float32" Name="x_N2" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="x^N2_w" NumberOfComponents="1" format="ascii">
           1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05
           1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05
           1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05
@@ -250,7 +250,7 @@
           1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05
           1e-05 1e-05 1e-05 1e-05 1e-05 1e-05
         </DataArray>
-        <DataArray type="Float32" Name="X_H2O" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="X^H2O_w" NumberOfComponents="1" format="ascii">
           0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984
           0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984
           0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984
@@ -286,7 +286,7 @@
           0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984
           0.999984 0.999984 0.999984 0.999984 0.999984 0.999984
         </DataArray>
-        <DataArray type="Float32" Name="X_N2" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="X^N2_w" NumberOfComponents="1" format="ascii">
           1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05
           1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05
           1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05
diff --git a/test/references/1p2cniboxconvection-reference.vtu b/test/references/1p2cniboxconvection-reference.vtu
index 9205c727fece99debb5323dfb47977c3528f596b..348c88967ccd011f226f11911aade69c75ea26d6 100644
--- a/test/references/1p2cniboxconvection-reference.vtu
+++ b/test/references/1p2cniboxconvection-reference.vtu
@@ -78,7 +78,7 @@
           9.99937e-05 -3.3521e-19 0 9.99937e-05 -3.3521e-19 0 9.99937e-05 0 0 9.99937e-05 0 0
           9.99937e-05 0 0 9.99937e-05 0 0
         </DataArray>
-        <DataArray type="Float32" Name="x_H2O" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="x^H2O_w" NumberOfComponents="1" format="ascii">
           1 1 1 1 1 1 1 1 1 1 1 1
           1 1 1 1 1 1 1 1 1 1 1 1
           1 1 1 1 1 1 1 1 1 1 1 1
@@ -94,7 +94,7 @@
           1 1 1 1 1 1 1 1 1 1 1 1
           1 1 1 1 1 1
         </DataArray>
-        <DataArray type="Float32" Name="x_N2" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="x^N2_w" NumberOfComponents="1" format="ascii">
           1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10
           1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10
           1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10
@@ -110,7 +110,7 @@
           1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10
           1e-10 1e-10 1e-10 1e-10 1e-10 1e-10
         </DataArray>
-        <DataArray type="Float32" Name="X_H2O" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="X^H2O_w" NumberOfComponents="1" format="ascii">
           1 1 1 1 1 1 1 1 1 1 1 1
           1 1 1 1 1 1 1 1 1 1 1 1
           1 1 1 1 1 1 1 1 1 1 1 1
@@ -126,7 +126,7 @@
           1 1 1 1 1 1 1 1 1 1 1 1
           1 1 1 1 1 1
         </DataArray>
-        <DataArray type="Float32" Name="X_N2" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="X^N2_w" NumberOfComponents="1" format="ascii">
           1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10
           1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10
           1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10
diff --git a/test/references/1p2cniccconduction-reference.vtu b/test/references/1p2cniccconduction-reference.vtu
index 010f91d2419e239afedfb53a8a5f69ad19ba41ad..19a46e53e37e0d1f72e776ba9fa51849d666235c 100644
--- a/test/references/1p2cniccconduction-reference.vtu
+++ b/test/references/1p2cniccconduction-reference.vtu
@@ -93,7 +93,7 @@
           8.81741e-11 0 0 8.81741e-11 0 0 8.81741e-11 0 0 8.81741e-11 0 0
           8.81741e-11 0 0 8.81741e-11 0 0 8.81741e-11 0 0 8.81741e-11 0 0
         </DataArray>
-        <DataArray type="Float32" Name="x_H2O" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="x^H2O_w" NumberOfComponents="1" format="ascii">
           0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999
           0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999
           0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999
@@ -112,7 +112,7 @@
           0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999
           0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999
         </DataArray>
-        <DataArray type="Float32" Name="x_N2" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="x^N2_w" NumberOfComponents="1" format="ascii">
           1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05
           1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05
           1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05
@@ -131,7 +131,7 @@
           1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05
           1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05
         </DataArray>
-        <DataArray type="Float32" Name="X_H2O" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="X^H2O_w" NumberOfComponents="1" format="ascii">
           0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984
           0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984
           0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984
@@ -150,7 +150,7 @@
           0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984
           0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984 0.999984
         </DataArray>
-        <DataArray type="Float32" Name="X_N2" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="X^N2_w" NumberOfComponents="1" format="ascii">
           1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05
           1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05
           1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05 1.55498e-05
diff --git a/test/references/1p2cniccconvection-reference.vtu b/test/references/1p2cniccconvection-reference.vtu
index b5fab5e160c653e2222e4481329a7a01e650279f..0236ae9d902077b1b90332dc21fbcd9dbf812dc1 100644
--- a/test/references/1p2cniccconvection-reference.vtu
+++ b/test/references/1p2cniccconvection-reference.vtu
@@ -43,7 +43,7 @@
           9.99936e-05 0 0 9.99936e-05 0 0 9.99936e-05 0 0 9.99936e-05 0 0
           9.99936e-05 0 0 9.99936e-05 0 0 9.99937e-05 0 0 9.99937e-05 0 0
         </DataArray>
-        <DataArray type="Float32" Name="x_H2O" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="x^H2O_w" NumberOfComponents="1" format="ascii">
           1 1 1 1 1 1 1 1 1 1 1 1
           1 1 1 1 1 1 1 1 1 1 1 1
           1 1 1 1 1 1 1 1 1 1 1 1
@@ -52,7 +52,7 @@
           1 1 1 1 1 1 1 1 1 1 1 1
           1 1 1 1 1 1 1 1
         </DataArray>
-        <DataArray type="Float32" Name="x_N2" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="x^N2_w" NumberOfComponents="1" format="ascii">
           1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10
           1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10
           1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10
@@ -61,7 +61,7 @@
           1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10
           1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10 1e-10
         </DataArray>
-        <DataArray type="Float32" Name="X_H2O" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="X^H2O_w" NumberOfComponents="1" format="ascii">
           1 1 1 1 1 1 1 1 1 1 1 1
           1 1 1 1 1 1 1 1 1 1 1 1
           1 1 1 1 1 1 1 1 1 1 1 1
@@ -70,7 +70,7 @@
           1 1 1 1 1 1 1 1 1 1 1 1
           1 1 1 1 1 1 1 1
         </DataArray>
-        <DataArray type="Float32" Name="X_N2" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="X^N2_w" NumberOfComponents="1" format="ascii">
           1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10
           1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10
           1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10 1.55499e-10
diff --git a/test/references/1p2cniccmpfaconduction-reference.vtu b/test/references/1p2cniccmpfaconduction-reference.vtu
index 351f7d486290ff257d4ca24467e0dfe7a5980faf..2a49571b586baea8d9eee52a80952f72830dc624 100644
--- a/test/references/1p2cniccmpfaconduction-reference.vtu
+++ b/test/references/1p2cniccmpfaconduction-reference.vtu
@@ -41,7 +41,7 @@
           0.000466521 0.000442597 0.000418673 0.000394748 0.000370824 0.0003469 0.000322976 0.000299052 0.000275128 0.000251204 0.000227279 0.000203355
           0.000179431 0.000155507 0.000131583 0.000107659 8.37345e-05 5.98104e-05 3.58862e-05 1.19621e-05
         </DataArray>
-        <DataArray type="Float32" Name="x_H2O" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="x^H2O_w" NumberOfComponents="1" format="ascii">
           0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999
           0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999
           0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999
@@ -60,7 +60,7 @@
           0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999
           0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999 0.99999
         </DataArray>
-        <DataArray type="Float32" Name="x_N2" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="x^N2_w" NumberOfComponents="1" format="ascii">
           1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05
           1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05
           1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05
@@ -79,7 +79,7 @@
           1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05
           1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05 1e-05
         </DataArray>
-        <DataArray type="Float32" Name="X_H2O" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="X^H2O_w" NumberOfComponents="1" format="ascii">
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diff --git a/test/references/2pboxdfm_3d_tets-reference.vtu b/test/references/2pboxdfm_3d_tets-reference.vtu
index 17f598426dbf93913a89be9225beae92d87c4565..02aec09b08d0a4c4f4f4349bb76b44af984146f2 100644
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diff --git a/test/references/2pdfm-reference.vtu b/test/references/2pdfm-reference.vtu
index 6f941b19cf0d7d5bd3428e279b9695e588555c94..6f2557566dc08bc24ef0e71e98abfaa4b0c01378 100644
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diff --git a/test/references/2pncdiffusioncc-reference.vtu b/test/references/2pncdiffusioncc-reference.vtu
index 9889ea81d7f16183774cfa5fdbbcf911d6dad971..b57ccd87f32e11953fa5280ca86d24eb15a42990 100644
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diff --git a/test/references/3pniconductionbox-reference.vtu b/test/references/3pniconductionbox-reference.vtu
index a73f803f8221f8ba351bd4587ffd73e9021a1d2b..f9835c8136c7a7f9021c71e4d2c58d7c4fd4f5e6 100644
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diff --git a/test/references/3pniconductioncc-reference.vtu b/test/references/3pniconductioncc-reference.vtu
index 578395b47d825c97d49d0b72b4be5642b2790a71..65d4779a05107678472cfdf8b42a49b748113341 100644
--- a/test/references/3pniconductioncc-reference.vtu
+++ b/test/references/3pniconductioncc-reference.vtu
@@ -2,8 +2,8 @@
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diff --git a/test/references/3pniconvectionbox-reference.vtu b/test/references/3pniconvectionbox-reference.vtu
index 4d19b713d1a7267bf4783d5cdcd188735b69cb7f..f765bcaed56a8561f1b5c877532b607296ac748e 100644
--- a/test/references/3pniconvectionbox-reference.vtu
+++ b/test/references/3pniconvectionbox-reference.vtu
@@ -2,8 +2,8 @@
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diff --git a/test/references/3pniconvectioncc-reference.vtu b/test/references/3pniconvectioncc-reference.vtu
index e9092906b322d8803c3c88f2e029c1038499dbfd..0bc92e7712a878dc93fe1776c0a891e2d227cb77 100644
--- a/test/references/3pniconvectioncc-reference.vtu
+++ b/test/references/3pniconvectioncc-reference.vtu
@@ -2,8 +2,8 @@
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-      <CellData Scalars="sw" Vectors="velocity_w (m/s)">
-        <DataArray type="Float32" Name="sw" NumberOfComponents="1" format="ascii">
+      <CellData Scalars="S_w" Vectors="velocity_w (m/s)">
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diff --git a/test/references/3pwateroilbox-reference.vtu b/test/references/3pwateroilbox-reference.vtu
index 6dcac1e41ce073457c85aa68bfd287ce1bfe44c0..a3a207bc5c7c1d2b08179f3fddd8aaf5a2a8b01d 100644
--- a/test/references/3pwateroilbox-reference.vtu
+++ b/test/references/3pwateroilbox-reference.vtu
@@ -2,8 +2,8 @@
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diff --git a/test/references/cc2pcornerpoint-reference.vtu b/test/references/cc2pcornerpoint-reference.vtu
index fc413fa086e360c9a32975159afeffa16df5f807..a009cc2d792bdf747c221e50e6f40dc7703b2a28 100644
--- a/test/references/cc2pcornerpoint-reference.vtu
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@@ -9,28 +9,28 @@
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diff --git a/test/references/co2box-reference.vtu b/test/references/co2box-reference.vtu
index 9df3f76aeb48500795212ac354bf7e1ca0d1f1ac..c3a38fd81e8ff84f419c83a1226847c7c3639c4f 100644
--- a/test/references/co2box-reference.vtu
+++ b/test/references/co2box-reference.vtu
@@ -2,8 +2,8 @@
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diff --git a/test/references/co2cc-reference.vtu b/test/references/co2cc-reference.vtu
index 2ad973753df9eaae26ea3e1a461b3804463837be..8faecf1e4fef6f1d9ba470735f7b63eb572e2848 100644
--- a/test/references/co2cc-reference.vtu
+++ b/test/references/co2cc-reference.vtu
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diff --git a/test/references/co2nibox-reference.vtu b/test/references/co2nibox-reference.vtu
index 5409e871890150a8f6276b3eff82379e7e0e8e77..30e87a5c45d566f1a2ad17c60995253931f44ecc 100644
--- a/test/references/co2nibox-reference.vtu
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diff --git a/test/references/co2nicc-reference.vtu b/test/references/co2nicc-reference.vtu
index 078985c34ed744cc8738908b16dfe1d559573538..97c30b9aa4719eab9e17a63df526b748bdc52f8d 100644
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diff --git a/test/references/column3p3cnibox-reference.vtu b/test/references/column3p3cnibox-reference.vtu
index 7ebff335398d65044bda1773cdb7c3d21b9ece9c..59554e185a6a93de6bc373977da539cdb0cc5a66 100644
--- a/test/references/column3p3cnibox-reference.vtu
+++ b/test/references/column3p3cnibox-reference.vtu
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@@ -187,7 +187,7 @@
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-        <DataArray type="Float32" Name="rhog" NumberOfComponents="1" format="ascii">
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diff --git a/test/references/column3p3cnicc-reference.vtu b/test/references/column3p3cnicc-reference.vtu
index 250a9084cd4301889e0fdc7f250c502be2c86e02..c4e9fee7db369da170b97d35afe792a76a32da40 100644
--- a/test/references/column3p3cnicc-reference.vtu
+++ b/test/references/column3p3cnicc-reference.vtu
@@ -2,8 +2,8 @@
 <VTKFile type="UnstructuredGrid" version="0.1" byte_order="LittleEndian">
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     <Piece NumberOfCells="120" NumberOfPoints="242">
-      <CellData Scalars="Sw">
-        <DataArray type="Float32" Name="Sw" NumberOfComponents="1" format="ascii">
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+        <DataArray type="Float32" Name="S_w" NumberOfComponents="1" format="ascii">
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@@ -63,7 +63,7 @@
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diff --git a/test/references/combustion-reference.vtp b/test/references/combustion-reference.vtp
index db74d7cec389a6bcc8a864a9b8173f334a74930c..ccdd59325bb992af6b0d0c82e6cb74cd30c39255 100644
--- a/test/references/combustion-reference.vtp
+++ b/test/references/combustion-reference.vtp
@@ -174,7 +174,7 @@
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+        <DataArray type="Float32" Name="x^SimpleH2O_w" NumberOfComponents="1" format="ascii">
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@@ -193,7 +193,7 @@
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@@ -212,7 +212,7 @@
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+        <DataArray type="Float32" Name="x^SimpleH2O_n" NumberOfComponents="1" format="ascii">
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@@ -231,7 +231,7 @@
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-        <DataArray type="Float32" Name="x_n^N2" NumberOfComponents="1" format="ascii">
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diff --git a/test/references/evaporationatmosphere-reference.vtu b/test/references/evaporationatmosphere-reference.vtu
index 0c5da736c085d2887e82504466e0716e719113ef..2a749f8f1e75da6b1062773da2e7e5eeaf6f40d5 100644
--- a/test/references/evaporationatmosphere-reference.vtu
+++ b/test/references/evaporationatmosphere-reference.vtu
@@ -372,7 +372,7 @@
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-        <DataArray type="Float32" Name="x_w^H2O" NumberOfComponents="1" format="ascii">
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@@ -413,7 +413,7 @@
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+        <DataArray type="Float32" Name="x^N2_n" NumberOfComponents="1" format="ascii">
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diff --git a/test/references/fracturebox2p-reference.vtu b/test/references/fracturebox2p-reference.vtu
index 252871f545650a69531bd49394ba624e07c2c3ef..c863d3de6508b980e219ad30c9fee88cda1ef827 100644
--- a/test/references/fracturebox2p-reference.vtu
+++ b/test/references/fracturebox2p-reference.vtu
@@ -2,8 +2,8 @@
 <VTKFile type="UnstructuredGrid" version="0.1" byte_order="LittleEndian">
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-      <PointData Scalars="Sn">
-        <DataArray type="Float32" Name="Sn" NumberOfComponents="1" format="ascii">
+      <PointData Scalars="S_n">
+        <DataArray type="Float32" Name="S_n" NumberOfComponents="1" format="ascii">
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@@ -81,7 +81,7 @@
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@@ -393,7 +393,7 @@
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@@ -471,7 +471,7 @@
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+        <DataArray type="Float32" Name="rho_n" NumberOfComponents="1" format="ascii">
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diff --git a/test/references/fracturebox2p_gravity-reference.vtu b/test/references/fracturebox2p_gravity-reference.vtu
index cf6f812df3db3fe67563083533495581cc12a09b..559a51f516f24f01a0567ff28ac36ff14506cf4c 100644
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diff --git a/test/references/fracturecc2p-reference.vtu b/test/references/fracturecc2p-reference.vtu
index 0bb78c563d21df7460a36dc7f156b6eac5b7eda9..91a85d2b0e68a8955591cf46498d28520adeff4e 100644
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diff --git a/test/references/fracturecc2p_gravity-reference.vtu b/test/references/fracturecc2p_gravity-reference.vtu
index fdb2e34e7c1653941235af086f2dfb69fdb3ce64..734246274ca2e8e01d9fee5eb44947c8d685b6aa 100644
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diff --git a/test/references/fractureccmpfa2p-reference.vtu b/test/references/fractureccmpfa2p-reference.vtu
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diff --git a/test/references/fractureccmpfa2p_gravity-reference.vtu b/test/references/fractureccmpfa2p_gravity-reference.vtu
index 4cbb47e0d8bf69990fd541e6593642b14174890c..a47d62de5fb86fe852274f4abffa4281fb240079 100644
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diff --git a/test/references/fuelcell2pnccc-reference.vtu b/test/references/fuelcell2pnccc-reference.vtu
index 3a9883ed6eaa9b4c05d47f695d593afc0ddfa2eb..f49e58b37b4110fd2a3d843d9bb0a89972f95c66 100644
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diff --git a/test/references/generalizeddirichlet-reference.vtp b/test/references/generalizeddirichlet-reference.vtp
index a6db8f3a5fd7fdaf1792a072ea01f19c4b362b3f..ede61fa12e55be55e9fb1bc9248bfc76b85e8a92 100644
--- a/test/references/generalizeddirichlet-reference.vtp
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@@ -2,8 +2,8 @@
 <VTKFile type="PolyData" version="0.1" byte_order="LittleEndian">
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diff --git a/test/references/generallens_box-reference.vtu b/test/references/generallens_box-reference.vtu
index bfa5db43aa0a6496d3c87fc22ef0232d098d8a15..41d5a3beba67bd8272f701ea4f5bb7087ee168eb 100644
--- a/test/references/generallens_box-reference.vtu
+++ b/test/references/generallens_box-reference.vtu
@@ -2,8 +2,8 @@
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diff --git a/test/references/generallens_cc-reference.vtu b/test/references/generallens_cc-reference.vtu
index 48037a4ff8bdc83e12c31bc8242959671f889a53..7bb283d1ed84837668638ea54e9bfd99e4dbe321 100644
--- a/test/references/generallens_cc-reference.vtu
+++ b/test/references/generallens_cc-reference.vtu
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diff --git a/test/references/infiltration3pbox-reference.vtu b/test/references/infiltration3pbox-reference.vtu
index e0a89ebfae5760cd61fbcca06848dd98b7cc460a..5ccc1ca0962831ff9b7a3223818e146044f7e965 100644
--- a/test/references/infiltration3pbox-reference.vtu
+++ b/test/references/infiltration3pbox-reference.vtu
@@ -2,8 +2,8 @@
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diff --git a/test/references/infiltration3pcc-reference.vtu b/test/references/infiltration3pcc-reference.vtu
index 4415cf588793d4f9d2380dcd27f173b39f29c8d4..b6e9cc957fdda3dc36e8b3e497c35d126071ab88 100644
--- a/test/references/infiltration3pcc-reference.vtu
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diff --git a/test/references/infiltrationbox-reference.vtu b/test/references/infiltrationbox-reference.vtu
index 90ef5ceaab0add1e212702f6f9956e0a97a82917..18fdd77e20f251a5ee13c50d330fa530ac3ad233 100644
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           878.771 878.771 878.771 878.771 878.771 878.771 878.771 878.771 878.771 878.771 878.771 878.771
@@ -163,7 +163,7 @@
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-        <DataArray type="Float32" Name="rhog" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="rho_g" NumberOfComponents="1" format="ascii">
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diff --git a/test/references/infiltrationcc-reference.vtu b/test/references/infiltrationcc-reference.vtu
index 66ad1814b7aa02cef303a553c25959904e734d4e..75f09eff69b7d44c42ce1237c4b2bb69f65efd34 100644
--- a/test/references/infiltrationcc-reference.vtu
+++ b/test/references/infiltrationcc-reference.vtu
@@ -2,8 +2,8 @@
 <VTKFile type="UnstructuredGrid" version="0.1" byte_order="LittleEndian">
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     <Piece NumberOfCells="160" NumberOfPoints="205">
-      <CellData Scalars="Sw">
-        <DataArray type="Float32" Name="Sw" NumberOfComponents="1" format="ascii">
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+        <DataArray type="Float32" Name="S_w" NumberOfComponents="1" format="ascii">
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@@ -19,7 +19,7 @@
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@@ -35,7 +35,7 @@
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+        <DataArray type="Float32" Name="S_g" NumberOfComponents="1" format="ascii">
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@@ -51,7 +51,7 @@
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+        <DataArray type="Float32" Name="p_w" NumberOfComponents="1" format="ascii">
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-        <DataArray type="Float32" Name="pn" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="p_n" NumberOfComponents="1" format="ascii">
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@@ -83,7 +83,7 @@
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           87610.1 87609.4 87608.6 87608.4
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-        <DataArray type="Float32" Name="pg" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="p_g" NumberOfComponents="1" format="ascii">
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@@ -99,7 +99,7 @@
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           99987.7 99986.9 99986.2 99985.9
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-        <DataArray type="Float32" Name="rhow" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="rho_w" NumberOfComponents="1" format="ascii">
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           999.733 999.733 999.733 999.733 999.733 999.733 999.733 999.733 999.733 999.733 999.733 999.733
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@@ -115,7 +115,7 @@
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           999.706 999.706 999.706 999.706
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-        <DataArray type="Float32" Name="rhon" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="rho_n" NumberOfComponents="1" format="ascii">
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           878.771 878.771 878.771 878.771 878.771 878.771 878.771 878.771 878.771 878.771 878.771 878.771
@@ -131,7 +131,7 @@
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           878.771 878.771 878.771 878.771
         </DataArray>
-        <DataArray type="Float32" Name="rhog" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="rho_g" NumberOfComponents="1" format="ascii">
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           1.65714 1.65647 1.6558 1.65513 1.65446 1.65379 1.65312 1.65245 1.65178 1.65111 1.65044 1.64977
diff --git a/test/references/injection2pnibox-cube-reference.vtu b/test/references/injection2pnibox-cube-reference.vtu
index 88e6d3f449b1790b43fc2a2442afd5203f6f4964..40c961b0692e94f2ef83a67e1caf0efbf824a206 100644
--- a/test/references/injection2pnibox-cube-reference.vtu
+++ b/test/references/injection2pnibox-cube-reference.vtu
@@ -2,8 +2,8 @@
 <VTKFile type="UnstructuredGrid" version="0.1" byte_order="LittleEndian">
   <UnstructuredGrid>
     <Piece NumberOfCells="384" NumberOfPoints="425">
-      <PointData Scalars="Sw">
-        <DataArray type="Float32" Name="Sw" NumberOfComponents="1" format="ascii">
+      <PointData Scalars="S_w">
+        <DataArray type="Float32" Name="S_w" NumberOfComponents="1" format="ascii">
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           1 1 1 1 1 1 1 1 1 1 1 1
           1 1 1 1 1 1 1 1 1 1 1 1
@@ -41,7 +41,7 @@
           1 1 1 1 1 1 1 1 1 1 1 1
           1 1 1 1 1
         </DataArray>
-        <DataArray type="Float32" Name="Sn" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="S_n" NumberOfComponents="1" format="ascii">
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@@ -79,7 +79,7 @@
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         </DataArray>
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+        <DataArray type="Float32" Name="p_w" NumberOfComponents="1" format="ascii">
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@@ -117,7 +117,7 @@
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           2.62178e+07 2.62182e+07 2.62185e+07 2.62187e+07 2.62188e+07
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-        <DataArray type="Float32" Name="pn" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="p_n" NumberOfComponents="1" format="ascii">
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           2.66058e+07 2.65818e+07 2.66068e+07 2.65829e+07 2.66079e+07 2.65839e+07 2.66089e+07 2.6585e+07 2.661e+07 2.6586e+07 2.6611e+07 2.65871e+07
@@ -193,7 +193,7 @@
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           10000 10000 10000 10000 10000
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+        <DataArray type="Float32" Name="rho_w" NumberOfComponents="1" format="ascii">
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@@ -231,7 +231,7 @@
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         </DataArray>
-        <DataArray type="Float32" Name="rhoN" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="rho_n" NumberOfComponents="1" format="ascii">
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@@ -269,7 +269,7 @@
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           243.571 243.575 243.577 243.579 243.58
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-        <DataArray type="Float32" Name="mobW" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="mob_w" NumberOfComponents="1" format="ascii">
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           3141.3 3138.73 3141.3 3138.73 3141.3 3138.73 3141.3 3138.72 3141.29 3138.72 3141.29 3138.72
@@ -307,7 +307,7 @@
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-        <DataArray type="Float32" Name="mobN" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="mob_n" NumberOfComponents="1" format="ascii">
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diff --git a/test/references/injection2pnibox-simplex-reference.vtu b/test/references/injection2pnibox-simplex-reference.vtu
index 0931e2e40929d44b8ff8007e0a2de1d353a98017..446e4f216003e68c3d42fec07c2dd881a6e1ee82 100644
--- a/test/references/injection2pnibox-simplex-reference.vtu
+++ b/test/references/injection2pnibox-simplex-reference.vtu
@@ -2,8 +2,8 @@
 <VTKFile type="UnstructuredGrid" version="0.1" byte_order="LittleEndian">
   <UnstructuredGrid>
     <Piece NumberOfCells="768" NumberOfPoints="425">
-      <PointData Scalars="Sw">
-        <DataArray type="Float32" Name="Sw" NumberOfComponents="1" format="ascii">
+      <PointData Scalars="S_w">
+        <DataArray type="Float32" Name="S_w" NumberOfComponents="1" format="ascii">
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           1 1 1 1 1 1 1 1 1 1 1 1
           1 1 1 1 1 1 1 1 1 1 1 1
@@ -41,7 +41,7 @@
           1 1 1 1 1 1 1 1 1 1 1 1
           1 1 1 1 1
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-        <DataArray type="Float32" Name="Sn" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="S_n" NumberOfComponents="1" format="ascii">
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@@ -79,7 +79,7 @@
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@@ -117,7 +117,7 @@
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           2.62179e+07 2.62183e+07 2.62186e+07 2.62187e+07 2.62188e+07
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-        <DataArray type="Float32" Name="pn" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="p_n" NumberOfComponents="1" format="ascii">
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@@ -193,7 +193,7 @@
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+        <DataArray type="Float32" Name="rho_w" NumberOfComponents="1" format="ascii">
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@@ -231,7 +231,7 @@
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-        <DataArray type="Float32" Name="rhoN" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="rho_n" NumberOfComponents="1" format="ascii">
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@@ -269,7 +269,7 @@
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-        <DataArray type="Float32" Name="mobW" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="mob_w" NumberOfComponents="1" format="ascii">
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@@ -307,7 +307,7 @@
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diff --git a/test/references/injection2pnicc-cube-reference.vtu b/test/references/injection2pnicc-cube-reference.vtu
index afa9355a6cbab1674b66352cabf2f476fe4667c9..1b610b3bb472b225efb15ac7cc9e18646181360b 100644
--- a/test/references/injection2pnicc-cube-reference.vtu
+++ b/test/references/injection2pnicc-cube-reference.vtu
@@ -2,8 +2,8 @@
 <VTKFile type="UnstructuredGrid" version="0.1" byte_order="LittleEndian">
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     <Piece NumberOfCells="384" NumberOfPoints="425">
-      <CellData Scalars="Sw">
-        <DataArray type="Float32" Name="Sw" NumberOfComponents="1" format="ascii">
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@@ -37,7 +37,7 @@
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diff --git a/test/references/injection2pnicc-simplex-reference.vtu b/test/references/injection2pnicc-simplex-reference.vtu
index 29bd961d8ac45383c8f6d2f56aeae4d14ff444fe..8c734a0c03e0dd46009b098cf0cf2bcf05783e26 100644
--- a/test/references/injection2pnicc-simplex-reference.vtu
+++ b/test/references/injection2pnicc-simplex-reference.vtu
@@ -2,8 +2,8 @@
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diff --git a/test/references/injectionbox-reference.vtu b/test/references/injectionbox-reference.vtu
index 9c5804ae21536dff0713e798764575edc0438890..f125a69d01a91be56cc183b154e037d36bad30c0 100644
--- a/test/references/injectionbox-reference.vtu
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diff --git a/test/references/injectioncc-reference.vtu b/test/references/injectioncc-reference.vtu
index 334c78fed9649e3045853154a670b5fb19a32ff7..83c5ebf22f6b1bdec0ee00c6b7ff5d93ef488fac 100644
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diff --git a/test/references/kuevette3p3cnibox-reference.vtu b/test/references/kuevette3p3cnibox-reference.vtu
index f23c750ca277d8dc0f57f22dce535ee21f784c8f..8f6b6d9cd833389f5d926e6c18f131a214ca296e 100644
--- a/test/references/kuevette3p3cnibox-reference.vtu
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diff --git a/test/references/lensbox-reference.vtu b/test/references/lensbox-reference.vtu
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diff --git a/test/references/lensbox_ifsolver-reference.vtu b/test/references/lensbox_ifsolver-reference.vtu
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diff --git a/test/references/lensboxadaptive-reference.vtu b/test/references/lensboxadaptive-reference.vtu
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diff --git a/test/references/lensccadaptive-reference.vtu b/test/references/lensccadaptive-reference.vtu
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diff --git a/test/references/lensccadaptivepointsource-reference.vtu b/test/references/lensccadaptivepointsource-reference.vtu
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index 3c0a46a226d152c725d4dc2117b4de9d1a0dd928..9ba7e63706cc3cf9d59a774bbfa7f3da6b1be4fd 100644
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diff --git a/test/references/mpnc_2p2c_box-reference.vtu b/test/references/mpnc_2p2c_box-reference.vtu
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diff --git a/test/references/mpnc_2p2c_tpfa-reference.vtu b/test/references/mpnc_2p2c_tpfa-reference.vtu
index 774180bb16d4df65ca9a0003d28a81c5b6b30fbc..63aa164b178c521bf5a14cad9453b75551d94db6 100644
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diff --git a/test/references/obstaclebox-reference.vtu b/test/references/obstaclebox-reference.vtu
index 8083bc2667fa784d6e212cc8dd024b7bb76cea3b..d348c78d9a02e006b8e444be8c93f63bddcd1bf5 100644
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diff --git a/test/references/obstaclecc-reference.vtu b/test/references/obstaclecc-reference.vtu
index d866cc6b5025f27f09437f5a446178390632ba0d..6003008ca475dc408d363df5651509c1a6f3dc2c 100644
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diff --git a/test/references/saltflushtpfa2pncmin-reference.vtu b/test/references/saltflushtpfa2pncmin-reference.vtu
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--- a/test/references/saltflushtpfa2pncmin-reference.vtu
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diff --git a/test/references/steaminjectionbox-reference.vtu b/test/references/steaminjectionbox-reference.vtu
index feca2fc2a7f2e369f1266dd2a48269993a8dfc4f..620badca7a349545ebe8cc4a27961cde19ea3774 100644
--- a/test/references/steaminjectionbox-reference.vtu
+++ b/test/references/steaminjectionbox-reference.vtu
@@ -2,8 +2,8 @@
 <VTKFile type="UnstructuredGrid" version="0.1" byte_order="LittleEndian">
   <UnstructuredGrid>
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-      <PointData Scalars="Sw">
-        <DataArray type="Float32" Name="Sw" NumberOfComponents="1" format="ascii">
+      <PointData Scalars="S_w">
+        <DataArray type="Float32" Name="S_w" NumberOfComponents="1" format="ascii">
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@@ -25,7 +25,7 @@
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@@ -69,7 +69,7 @@
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+        <DataArray type="Float32" Name="p_n" NumberOfComponents="1" format="ascii">
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diff --git a/test/references/steaminjectioncc-reference.vtu b/test/references/steaminjectioncc-reference.vtu
index 70ac918116b56e90a4386bafe509082f4d480acd..42ddf315ace161c643092bd039c93af4bbe58b37 100644
--- a/test/references/steaminjectioncc-reference.vtu
+++ b/test/references/steaminjectioncc-reference.vtu
@@ -2,8 +2,8 @@
 <VTKFile type="UnstructuredGrid" version="0.1" byte_order="LittleEndian">
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-      <CellData Scalars="Sw">
-        <DataArray type="Float32" Name="Sw" NumberOfComponents="1" format="ascii">
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@@ -72,7 +72,7 @@
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diff --git a/test/references/test_stokes1p2cdarcy2p2cvertical_darcy-reference.vtu b/test/references/test_stokes1p2cdarcy2p2cvertical_darcy-reference.vtu
index 39442a953770bcb46a52ec54942f0056d7b4e720..d4bfc3c3c71b7d9db750802f987203a043d20a5d 100644
--- a/test/references/test_stokes1p2cdarcy2p2cvertical_darcy-reference.vtu
+++ b/test/references/test_stokes1p2cdarcy2p2cvertical_darcy-reference.vtu
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+      <CellData Scalars="S_n" Vectors="velocity_liquid (m/s)">
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diff --git a/test/references/test_stokes1p2cnidarcy2p2cni_horizontal_darcy-reference.vtu b/test/references/test_stokes1p2cnidarcy2p2cni_horizontal_darcy-reference.vtu
index d05543adddcea6f229400daeed08e17c75323ba2..cd2f8fc51aead65bfa3ad21ec4c820eeb335c8e5 100644
--- a/test/references/test_stokes1p2cnidarcy2p2cni_horizontal_darcy-reference.vtu
+++ b/test/references/test_stokes1p2cnidarcy2p2cni_horizontal_darcy-reference.vtu
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diff --git a/test/references/test_stokes1p2cnidarcy2p2cni_vertical_darcy-reference.vtu b/test/references/test_stokes1p2cnidarcy2p2cni_vertical_darcy-reference.vtu
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--- a/test/references/test_stokes1p2cnidarcy2p2cni_vertical_darcy-reference.vtu
+++ b/test/references/test_stokes1p2cnidarcy2p2cni_vertical_darcy-reference.vtu
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diff --git a/test/references/test_stokes1p2cnidarcy2p2cnihorizontal_darcy-reference.vtu b/test/references/test_stokes1p2cnidarcy2p2cnihorizontal_darcy-reference.vtu
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--- a/test/references/test_stokes1p2cnidarcy2p2cnihorizontal_darcy-reference.vtu
+++ b/test/references/test_stokes1p2cnidarcy2p2cnihorizontal_darcy-reference.vtu
@@ -2,8 +2,8 @@
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diff --git a/test/references/test_stokes1pdarcy2pvertical_darcy-reference.vtu b/test/references/test_stokes1pdarcy2pvertical_darcy-reference.vtu
index c4e03a1ef0f147e61792f9df793c16452736a79c..be7cc1399c94a489366b0bc16a51e5ceed568aed 100644
--- a/test/references/test_stokes1pdarcy2pvertical_darcy-reference.vtu
+++ b/test/references/test_stokes1pdarcy2pvertical_darcy-reference.vtu
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diff --git a/test/references/tracer-constvel-explicit-box-reference.vtu b/test/references/tracer-constvel-explicit-box-reference.vtu
index 7dd93704d506e5877cba76d13b88004feafcb344..c3574152cc14244288791d33079068fec567135f 100644
--- a/test/references/tracer-constvel-explicit-box-reference.vtu
+++ b/test/references/tracer-constvel-explicit-box-reference.vtu
@@ -2,8 +2,8 @@
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@@ -660,7 +660,7 @@
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-        <DataArray type="Float32" Name="X_tracer_1" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="X^tracer_1" NumberOfComponents="1" format="ascii">
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diff --git a/test/references/tracer-constvel-explicit-cc-reference.vtu b/test/references/tracer-constvel-explicit-cc-reference.vtu
index 2161ac8f279e57c000e311f971c03fe49d5d2f68..125e27b8434ae7a0eedb9e3030aa830b8d9cdbae 100644
--- a/test/references/tracer-constvel-explicit-cc-reference.vtu
+++ b/test/references/tracer-constvel-explicit-cc-reference.vtu
@@ -2,8 +2,8 @@
 <VTKFile type="UnstructuredGrid" version="0.1" byte_order="LittleEndian">
   <UnstructuredGrid>
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-      <CellData Scalars="x_tracer_0" Vectors="velocity_Groundwater (m/s)">
-        <DataArray type="Float32" Name="x_tracer_0" NumberOfComponents="1" format="ascii">
+      <CellData Scalars="x^tracer_0" Vectors="velocity_Groundwater (m/s)">
+        <DataArray type="Float32" Name="x^tracer_0" NumberOfComponents="1" format="ascii">
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@@ -214,7 +214,7 @@
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diff --git a/test/references/tracer-constvel-implicit-box-reference.vtu b/test/references/tracer-constvel-implicit-box-reference.vtu
index c2a25bbc302baeaca41e91555be9345369502489..0cfbea3fb28ab483e7da525be006588fb7086217 100644
--- a/test/references/tracer-constvel-implicit-box-reference.vtu
+++ b/test/references/tracer-constvel-implicit-box-reference.vtu
@@ -2,8 +2,8 @@
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-      <PointData Scalars="x_tracer_0" Vectors="velocity_Groundwater (m/s)">
-        <DataArray type="Float32" Name="x_tracer_0" NumberOfComponents="1" format="ascii">
+      <PointData Scalars="x^tracer_0" Vectors="velocity_Groundwater (m/s)">
+        <DataArray type="Float32" Name="x^tracer_0" NumberOfComponents="1" format="ascii">
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-        <DataArray type="Float32" Name="x_tracer_1" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="x^tracer_1" NumberOfComponents="1" format="ascii">
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diff --git a/test/references/tracer-constvel-implicit-cc-reference.vtu b/test/references/tracer-constvel-implicit-cc-reference.vtu
index 88166c35459bc871cd7a4d6624f27ed3a02abe5a..2d31cf8b19d8be481f385dfb85a0f86aaae7c5e2 100644
--- a/test/references/tracer-constvel-implicit-cc-reference.vtu
+++ b/test/references/tracer-constvel-implicit-cc-reference.vtu
@@ -2,8 +2,8 @@
 <VTKFile type="UnstructuredGrid" version="0.1" byte_order="LittleEndian">
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-      <CellData Scalars="x_tracer_0" Vectors="velocity_Groundwater (m/s)">
-        <DataArray type="Float32" Name="x_tracer_0" NumberOfComponents="1" format="ascii">
+      <CellData Scalars="x^tracer_0" Vectors="velocity_Groundwater (m/s)">
+        <DataArray type="Float32" Name="x^tracer_0" NumberOfComponents="1" format="ascii">
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@@ -214,7 +214,7 @@
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-        <DataArray type="Float32" Name="x_tracer_1" NumberOfComponents="1" format="ascii">
+        <DataArray type="Float32" Name="x^tracer_1" NumberOfComponents="1" format="ascii">
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diff --git a/test/references/tracer-sequential-transport-reference.vtu b/test/references/tracer-sequential-transport-reference.vtu
index 5666edb9bb5a8feec5d58b1821638b02ab709d1d..74e27b5eb6eabab1c0082f84aae23be45b5f6447 100644
--- a/test/references/tracer-sequential-transport-reference.vtu
+++ b/test/references/tracer-sequential-transport-reference.vtu
@@ -2,8 +2,8 @@
 <VTKFile type="UnstructuredGrid" version="0.1" byte_order="LittleEndian">
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-      <CellData Scalars="x_tracer_0" Vectors="velocity_Groundwater (m/s)">
-        <DataArray type="Float32" Name="x_tracer_0" NumberOfComponents="1" format="ascii">
+      <CellData Scalars="x^tracer_0" Vectors="velocity_Groundwater (m/s)">
+        <DataArray type="Float32" Name="x^tracer_0" NumberOfComponents="1" format="ascii">
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diff --git a/test/references/waterairbox-reference.vtu b/test/references/waterairbox-reference.vtu
index 67b8d67f1d1b387f69d0b99df1b55fe928d147bb..05b93afc87c4f40a8d7c54a599e4489e50933d90 100644
--- a/test/references/waterairbox-reference.vtu
+++ b/test/references/waterairbox-reference.vtu
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-      <PointData Scalars="Sn">
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diff --git a/test/references/wateraircc-reference.vtu b/test/references/wateraircc-reference.vtu
index 10a7f02d3a904d3794939118d18ee24940fa3dd0..f0fabf8cc0f4ba080f715a80188a5eba899faef2 100644
--- a/test/references/wateraircc-reference.vtu
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