{* adjustment of force constants fo the "parhcsdx.pro" force field to *}
{* avoid blow-ups.                                                    *}

{* location:                                                          *}
{* =========                                                          *}
{* *after* reading the structure and the parameter files and *before* *}
{* running minimization or dynamics.                                  *}

parameter

   bonds ( all ) ( all ) 1000 TOKEN

   angle ( all ) ( all ) ( all ) 500 TOKEN

   improper ( all ) ( all ) ( all ) (all ) 500 TOKEN TOKEN

   dihe ( chemical CH1E ) ( chemical C )  ( chemical N ) ( chemical  CH1E )
                        500.0   2 180.0 ! trans or cis PRO
   dihe ( chemical CH2E ) ( chemical C  ) ( chemical N ) ( chemical CH1E )
                        500.0   2 180.0 ! trans or cis PRO
   dihe (chemical CH2G ) ( chemical  C ) ( chemical N ) ( chemical CH1E )
                        500.0   2 180.0 ! trans or cis PRO
   dihe (all ) ( chemical C ) ( chemical NH1 ) ( all )  
                        500.0   1 0.0   ! always trans for other peptide bonds
end