# Adds "TER" cards after the residues "HOH" or "MOH"
BEGIN{resnum=1}
{prevres = resnum
 resnum = $6
 resname = $4
 if (resname == "HOH" || resname = "MOH"){
   if (resnum != prevres){
      print "TER"
      print
   } else { 
      print
   }
 } else {
   print
 }
}