[gmx-users] non-bonded sigma for amino nitrogen–carboxylate oxygen interactions in OPLSAA in GROMACS

[gozde ergin]

Dear users,

I am trying to change the sigma value of amino nitrogen–carboxylate oxygen interactions in OPLSAA in GROMACS.
However I have difficulties to understand which parameter i should change in ffnonbonded.itp file?
I am looking something like [ nonbond_params ] section however it is not exist in ffnonbonded.itp?
Any help would be appreciated.

Thanks in advance.