diff --git a/test/references/test_impes-reference.vtu b/test/references/test_impes-reference.vtu
index 338528145e71054c2350c2917783f0def5c08575..d76345786eb86ae1fa9a482480c5780c4bc8cbd2 100644
--- a/test/references/test_impes-reference.vtu
+++ b/test/references/test_impes-reference.vtu
@@ -21,19 +21,19 @@
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diff --git a/test/references/test_mpfal2p-reference.vtu b/test/references/test_mpfal2p-reference.vtu
index 81a51961d4f829e5fe15a2fb417cc00451398cd3..9e5c4fc465b371676c4a156ddf35f0d5d8a1d79c 100644
--- a/test/references/test_mpfal2p-reference.vtu
+++ b/test/references/test_mpfal2p-reference.vtu
@@ -4,135 +4,135 @@
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diff --git a/test/references/test_mpfal2padaptive-reference.vtu b/test/references/test_mpfal2padaptive-reference.vtu
index 7a98cc8108bdffd93989a81666d42e22dfec4ac4..dbed4cd2b138eb85882f91fe47a152320cf3c1f9 100644
--- a/test/references/test_mpfal2padaptive-reference.vtu
+++ b/test/references/test_mpfal2padaptive-reference.vtu
@@ -4,269 +4,269 @@
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diff --git a/test/references/test_mpfao2p-reference.vtu b/test/references/test_mpfao2p-reference.vtu
index da85172605bf9d850827c728f188167211b59a2f..864dfadf0939e8a5828d0d26194fd6e501d7d60c 100644
--- a/test/references/test_mpfao2p-reference.vtu
+++ b/test/references/test_mpfao2p-reference.vtu
@@ -4,135 +4,135 @@
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