[ESPResSo-users] Triple Cos term formula for Dihedral potential

[Muhammad Anwar]

Hello,
Dear Users,
I want to use triple cos term dihedral potential in my simulation, which is
V = 0.5 *( K1 * (1 - cos(phi) + K2 * (1 - cos(2*phi) + K3 * (1 - 
cos(3phi) ).. Can anybody give any suggestion, how can i amend the given 
dihedral potential to use this potential? There may be two 
possibilities, one in which i just put the tcl command like this

inter 3 dihedral 1 1 0
and change the dihedral file according to my need by putting the 
different values of K and phi, but this would be more specific for only 
one case. The second option may be i write separate header file for it 
and use it. If i use first option i will just change the fac value by 
adding new terms for force and energy. Is it ok? or should i write new 
code for it, if yes how can i write and add? Please guide me?
Thanks

Best Regards,
Muhammad Anwar