[gmx-users] non-harmonic position restraints

[Makoto Yoneya]

Dear GROMACS users:

I'd like to change the functional form for the position restraints potential
from the standard harmonic form to a non-harmonic form, e.g.,
4-th in the positional deviations, to be effective only in the case
for the large deviations.
Could you kindly points me about which routines to modify the 
functional form for the position restraints potential and the 
corresponding force?
Sorry if it was FAQ.

Regards.

Makoto Yoneya, Dr.
AIST, Tsukuba
JAPAN