--- trunk/OOPSE/libmdtools/CutoffGroup.hpp	2004/05/11 21:20:34	1159
+++ trunk/OOPSE/libmdtools/CutoffGroup.hpp	2004/05/12 15:02:03	1164
@@ -49,9 +49,9 @@ class CutoffGroup{
         mass = atom->getMass();
         totalMass += mass;
         atom->getPos(pos);
-        com[0] = pos[0] * mass;
-        com[1] = pos[1] * mass;
-        com[2] = pos[2] * mass;
+        com[0] += pos[0] * mass;
+        com[1] += pos[1] * mass;
+        com[2] += pos[2] * mass;
       }
 
       com[0] /= totalMass;