[gmx-users] 9-oder cosine series of dihedral angle

[Tom]

Dear Gmx Developer and Users,

*Is it possible for gromacs to use an 8-order or 9-oder cosine series for
dihedral angle computations?*

>From the menue, (Page 125, the table of Intramolecular Interactions
Definition)
there is one
----------
interaction type       directive     # at.       f. tp
proper dih. multi      dihedrals     4           9
------------

There is not detailed explanation about the format of these assignment in
ffbonded.itp of oplsaa.ff
*Can any one give an explanation about the format of typing these
parameters for 9-oder cosine series dihedral angle?*

Thanks,

Tom