diff -u -r1.3 -r1.4
--- G4RZFieldMap.cc	31 Aug 2005 01:21:26 -0000	1.3
+++ G4RZFieldMap.cc	31 Aug 2005 01:31:53 -0000	1.4
@@ -1,4 +1,4 @@

-// $Header: /cvs/lcd/lcdd/src/G4RZFieldMap.cc,v 1.3 2005/08/31 01:21:26 jeremy Exp $

+// $Header: /cvs/lcd/lcdd/src/G4RZFieldMap.cc,v 1.4 2005/08/31 01:31:53 jeremy Exp $

 #include "G4RZFieldMap.hh"
 
 #include "globals.hh"

@@ -119,6 +119,11 @@

   Bfield[1] = by;
   Bfield[2] = bz;
 

+  /* flip sign for negative z */
+  if ( Point[2] < 0. ) {
+    Bfield[2] = -Bfield[2];
+  }
+

   // DEBUG: prints
   std::cout << "brmin = " << brmin << std::endl;
   std::cout << "bzmin = " << bzmin << std::endl;