--- trunk/OOPSE/libmdtools/SimInfo.cpp	2004/05/11 21:14:26	1158
+++ trunk/OOPSE/libmdtools/SimInfo.cpp	2004/05/12 14:30:12	1163
@@ -607,7 +607,8 @@ void getFortranGroupArray(SimInfo* info, vector<double
       if(myMols[i].belongToCutoffGroup(atomIndex))
         continue;
       else{
-        mfact.push_back(myAtoms[j]->getMass());
+        // this is a fraction of the cutoff group's mass, not the mass itself!
+        mfact.push_back(1.0);
         groupList.push_back(myAtoms[j]->getIndex() + 1);
         groupStart.push_back(curIndex++);   
       }