\item {\tt GMX_NO_PULLVIR}: when set, do not add virial contribution to COM pull forces.
\item {\tt GMX_NOCHARGEGROUPS}: disables multi-atom charge groups, {\ie} each atom
in all non-solvent molecules is assigned its own charge group.
\item {\tt GMX_NO_PULLVIR}: when set, do not add virial contribution to COM pull forces.
\item {\tt GMX_NOCHARGEGROUPS}: disables multi-atom charge groups, {\ie} each atom
in all non-solvent molecules is assigned its own charge group.