[pm][velocity] Move phase loop inside velocity output
As noted in !1319 (merged) by @DennisGlaeser the velocity output would be more efficient if we could move the phase loop inside, and always compute the velocity for all phases.
As noted in !1319 (merged) by @DennisGlaeser the velocity output would be more efficient if we could move the phase loop inside, and always compute the velocity for all phases.