From: Ali Alizadeh (ali.alizadehmoj_at_gmail.com)
Date: Tue Aug 12 2014 - 16:31:15 CDT

Dear Axel,
I have a problem with writing improper dihedrals in lammps data file by
topotools. How can I write improper dihedrals? I want to keep the planar
shape of one part of molecule. I have a force field which defines such this
improper dihedrals.

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Sincerely
Ali Alizadeh