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

Mark Abraham Mark.Abraham at anu.edu.au
Thu Apr 1 20:58:56 CEST 2010

On 2/04/2010 4:50 AM, Lum Nforbi wrote:
> 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.

That's a CHARMM feature - they're a "wildcard" atom to which any type 
can match.


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