diff -u -r1.20 -r1.21
--- TrackUtils.java	3 Jul 2013 23:23:23 -0000	1.20
+++ TrackUtils.java	12 Jul 2013 20:58:55 -0000	1.21
@@ -28,7 +28,7 @@

 /**
  * 
  * @author Omar Moreno <[log in to unmask]>

- * @version $Id: TrackUtils.java,v 1.20 2013/07/03 23:23:23 phansson Exp $

+ * @version $Id: TrackUtils.java,v 1.21 2013/07/12 20:58:55 phansson Exp $

  * TODO: Switch to JLab coordinates
  */
 

@@ -270,9 +270,11 @@

              * Use code in WTrack to find the iterative solution to the interception
              */
             boolean debug = false;

-            WTrack wtrack = new WTrack(helfit,bfield,true); // B-field sign is flipped so flip!
-            if(debug) System.out.printf("getHelixPlaneIntercept:find intercept between plane defined by point on plane %s, unit vec %s, bfield %.3f, and WTrack \n%s \n",point_on_plane.toString(),unit_vec_normal_to_plane.toString(), bfield,wtrack.toString());
-            Hep3Vector intercept_point =  wtrack.getHelixAndPlaneIntercept(wtrack,point_on_plane, unit_vec_normal_to_plane, new BasicHep3Vector(0,0,1));

+            boolean flipBfield = true; // be careful
+            Hep3Vector B = new BasicHep3Vector(0,0,flipBfield?-1:1);
+            WTrack wtrack = new WTrack(helfit,bfield,flipBfield); //
+            if(debug) System.out.printf("getHelixPlaneIntercept:find intercept between plane defined by point on plane %s, unit vec %s, bfield %.3f, h=%s and WTrack \n%s \n",point_on_plane.toString(),unit_vec_normal_to_plane.toString(), bfield, B.toString(),wtrack.toString());
+            Hep3Vector intercept_point =  wtrack.getHelixAndPlaneIntercept(point_on_plane, unit_vec_normal_to_plane, B);

             if(debug) System.out.printf("getHelixPlaneIntercept: found intercept point at %s\n",intercept_point.toString());
             return intercept_point;
         }