Data Analysis of Fluctuation in Residue

GROMACS version:
GROMACS modification: Yes/No
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Hi! Good day. I wanna ask what are the commands in finding the fluctuation in residue. Thanks in advance. More power.

gmx rmfs (gmx rmsf — GROMACS 2021 documentation) provides the atom fluctuation, the option -res Calculate averages for each residue
Best regards

Thanks a lot