--- trunk/OOPSE/libmdtools/SimInfo.cpp	2004/05/11 21:14:26	1158
+++ trunk/OOPSE/libmdtools/SimInfo.cpp	2004/05/12 15:02:03	1164
@@ -453,8 +453,8 @@ void SimInfo::refreshSim(){
   
   getFortranGroupArray(this, mfact, ngroup, groupList, groupStart);
   //it may not be a good idea to pass the address of first element in vector
-  //since c++ standard does not require vector to be stored continously in meomory
-  //Most of the compilers will organize the memory of vector continously
+  //since c++ standard does not require vector to be stored continuously in meomory
+  //Most of the compilers will organize the memory of vector continuously
   setFsimulation( &fInfo, &n_global, &n_atoms, identArray, &n_exclude, excl, 
                   &nGlobalExcludes, globalExcludes, molMembershipArray, 
                   &mfact[0], &ngroup, &groupList[0], &groupStart[0], &isError);
@@ -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++);   
       }