[gmx-users] X's in the ffcharmm27bon.itp force field

[Lum Nforbi]

Hello all,

  Please, can someone let me know why there are X's in the [dihedraltypes]
section of the ffcharmm27bon.itp force field and what they actually stand
for? Could they be replaced with actual atoms or no?
I appreciate your replies.

Lum
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