Index: trunk/BNS/bns.cpp
===================================================================
--- trunk/BNS/bns.cpp	(revision 2417)
+++ trunk/BNS/bns.cpp	(revision 2418)
@@ -595,5 +595,5 @@
     }
     
-    ColumnVector dx = xyz - xB.Rows(1,3);
+    ColumnVector dx = xB.Rows(1,3) - xyz ;
     
     if (ii == 1) {