diff -u -r1.3 -r1.4
--- HPSTrack.java	23 Jul 2012 22:11:32 -0000	1.3
+++ HPSTrack.java	28 Sep 2012 22:13:46 -0000	1.4
@@ -299,12 +299,15 @@

      @return position[0] and direction[1] at Z=zfinal
      */
     public Hep3Vector[] getPositionAtZMap(double start, double xFinal, double step) {

+        return this.getPositionAtZMap(start, xFinal, step, true);
+    }
+        public Hep3Vector[] getPositionAtZMap(double start, double xFinal, double step, boolean debugOk) {

 
         double startFringe = start;
 
         _debugForward = false;
         if (xFinal > 900)

-            _debugForward = true;

+            _debugForward = debugOk ? true : false;

         // if looking upstream, we'll be propagating backwards
         if (xFinal < 0) {
             step = -step;