Unit.h and unit.c

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1

GROMACS version: 5.0.6
GROMACS modification: Yes/No
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Where can I find unit.h and unit.c file in gromacs–5.0.6
In gromacs-2019.6 it is inside /src/gromacs/math, but I am not finding it gromacs 5.0.6 version.

2

./src/gromacs/legacyheaders/physics.h
./src/gromacs/gmxlib/physics.c

3

thank you so much