Index: trunk/BNS/bns.cpp
===================================================================
--- trunk/BNS/bns.cpp	(revision 2102)
+++ trunk/BNS/bns.cpp	(revision 2107)
@@ -512,10 +512,10 @@
   }
 
-  ColumnVector dx = xyz - xB.Rows(1,3);
+  ColumnVector dx = xB.Rows(1,3) - xyz;
 
   ColumnVector rsw(3);
   XYZ_to_RSW(xB.Rows(1,3), vv, dx, rsw);
 
-  double dClk = (xx(4) - xB(4)) * 299792458.0;
+  double dClk = (xB(4) - xx(4)) * 299792458.0;