Gmx sasa query

GROMACS version:5.1.2
GROMACS modification: Yes/No
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After using command gmx sasa -s prod.tpr -f prod.xtc -or prod_residue.xvg -o prod.xvg
we are getting sasa of only 9 residues but in our protein we have 123 residues

Hi,
Did you get any error message? Could you provide more information?
It could be that some residues are not recognized as residues (e.i. since they are not standard) or your xtc file does not contain the whole protein? Or more?
I will also suggest to move to a more recent GROMACS version.
Thank you
Alessandra