diff -u -r1.4 -r1.5
--- SvtTrackExtrapolator.java	30 Aug 2012 03:31:13 -0000	1.4
+++ SvtTrackExtrapolator.java	9 Oct 2012 01:16:29 -0000	1.5
@@ -7,7 +7,7 @@

 
 public class SvtTrackExtrapolator {
 

-	Track track;

+	boolean isTrackSet = false;

 	TrackUtils trackUtils;
 	
 	public static final double ECAL_FACE   = 1524;  // mm

@@ -18,7 +18,7 @@

 	 * 
 	 */
 	public SvtTrackExtrapolator(){

-		track = null;

+		isTrackSet = false;

 		trackUtils = new TrackUtils();
 	}
 	

@@ -26,8 +26,16 @@

 	 * 
 	 */
 	public void setTrack(Track track){

-		this.track = track;

 		trackUtils.setTrack(track);

+                isTrackSet = true;
+	}
+        
+        /**
+	 * 
+	 */
+	public void setTrack(double[] pars){
+		trackUtils.setTrack(pars);
+                isTrackSet = true;

 	}
 	
 	/**

@@ -47,7 +55,7 @@

 	 */
 	public Hep3Vector extrapolateTrack(double z){
 	

-		if(track == null) throw new RuntimeException("Track has not been set!");

+		if(!isTrackSet) throw new RuntimeException("Track has not been set!");

 		
 		Hep3Vector trackPosition = null;
 		double dz = 0;