diff --git a/steering-files/src/main/resources/org/hps/steering/recon/EngineeringRun2015FullReconMCLayer0.lcsim b/steering-files/src/main/resources/org/hps/steering/recon/EngineeringRun2015FullReconMCLayer0.lcsim
index f9a499ef70..66b130f82f 100644
--- a/steering-files/src/main/resources/org/hps/steering/recon/EngineeringRun2015FullReconMCLayer0.lcsim
+++ b/steering-files/src/main/resources/org/hps/steering/recon/EngineeringRun2015FullReconMCLayer0.lcsim
@@ -146,7 +146,9 @@
             <ecalClusterCollectionName>EcalClustersCorr</ecalClusterCollectionName>         
             <trackCollectionNames>MatchedTracks GBLTracks</trackCollectionNames>
         </driver>
-        <driver name="TrackDataDriver" type="org.hps.recon.tracking.TrackDataDriver" />
+        <driver name="TrackDataDriver" type="org.hps.recon.tracking.TrackDataDriver">
+            <layerNum>7</layerNum>
+        </driver>
         <driver name="LCIOWriter" type="org.lcsim.util.loop.LCIODriver">
             <outputFilePath>${outputFile}.slcio</outputFilePath>
         </driver>
diff --git a/steering-files/src/main/resources/org/hps/steering/recon/PhysicsRun2016FullReconLayer0.lcsim b/steering-files/src/main/resources/org/hps/steering/recon/PhysicsRun2016FullReconLayer0.lcsim
index 82898850f4..9a08478a03 100644
--- a/steering-files/src/main/resources/org/hps/steering/recon/PhysicsRun2016FullReconLayer0.lcsim
+++ b/steering-files/src/main/resources/org/hps/steering/recon/PhysicsRun2016FullReconLayer0.lcsim
@@ -133,7 +133,9 @@
             <rmsTimeCut>8.0</rmsTimeCut>
         </driver>             
         <driver name="MergeTrackCollections" type="org.hps.recon.tracking.MergeTrackCollections" />
-        <driver name="TrackDataDriver" type="org.hps.recon.tracking.TrackDataDriver" />
+        <driver name="TrackDataDriver" type="org.hps.recon.tracking.TrackDataDriver">
+            <layerNum>7</layerNum>
+        </driver>
         <driver name="ReconParticleDriver" type="org.hps.recon.particle.HpsReconParticleDriver" > 
             <ecalClusterCollectionName>EcalClustersCorr</ecalClusterCollectionName>        
             <trackCollectionNames>MatchedTracks GBLTracks</trackCollectionNames>
diff --git a/tracking/src/main/java/org/hps/recon/tracking/TrackDataDriver.java b/tracking/src/main/java/org/hps/recon/tracking/TrackDataDriver.java
index 878df42cec..63b1fb1ffc 100644
--- a/tracking/src/main/java/org/hps/recon/tracking/TrackDataDriver.java
+++ b/tracking/src/main/java/org/hps/recon/tracking/TrackDataDriver.java
@@ -73,6 +73,9 @@ public final class TrackDataDriver extends Driver {
     /** The extrapolation step size */ 
     double stepSize = 5.0; // mm
     
+    /** The default number of layers */
+    int layerNum = 6;
+    
     /** Default constructor */
     public TrackDataDriver() {
     }
@@ -98,6 +101,15 @@ void setStepSize(double stepSize) {
         this.stepSize = stepSize; 
     }
     
+    /**
+     * Set number of tracking layers. Default is 6 layers.
+     * 
+     */
+    
+    public void setLayerNum(int layerNum) { 
+        this.layerNum = layerNum; 
+    }
+    
     /**
      * Method called by the framework when a new {@link Detector} geometry is
      * loaded. This method is called at the beginning of every run and 
@@ -283,7 +295,7 @@ protected void process(EventHeader event) {
              
                 // Calculate the track isolation constants for each of the 
                 // layers
-                Double[] isolations = TrackUtils.getIsolations(track, hitToStrips, hitToRotated);
+                Double[] isolations = TrackUtils.getIsolations(track, hitToStrips, hitToRotated,layerNum);
                 double qualityArray[] = new double[isolations.length];
                 for (int i = 0; i < isolations.length; i++) {
                     qualityArray[i] = isolations[i] == null ? -99999999.0 : isolations[i];
diff --git a/tracking/src/main/java/org/hps/recon/tracking/TrackUtils.java b/tracking/src/main/java/org/hps/recon/tracking/TrackUtils.java
index 1565d325cb..a8c5773b26 100644
--- a/tracking/src/main/java/org/hps/recon/tracking/TrackUtils.java
+++ b/tracking/src/main/java/org/hps/recon/tracking/TrackUtils.java
@@ -129,6 +129,7 @@ public static double[] getParametersAtNewRefPoint(double[] newRefPoint, double[]
         if (Math.abs( dphi ) > Math.PI) 
             throw new RuntimeException("dphi is large " +  dphi + " from phi0 " + phi0 
                                         + " and phinew " + phinew + " take care of the ambiguity!!??");
+            //System.out.println("dphi is large " +  dphi + " from phi0 " + phi0 + " and phinew " + phinew + " take care of the ambiguity!!??");
         
         // calculate new dca
         double dcanew = dca + dx*sinphi - dy*cosphi + (dx*cosphi + dy*sinphi)*Math.tan( dphi/2. );
@@ -1286,8 +1287,8 @@ public static double getIsolation(TrackerHit strip, TrackerHit otherStrip, Relat
      * @param hitToRotated
      * @return isolations for all 12 strip layers
      */
-    public static Double[] getIsolations(Track trk, RelationalTable hitToStrips, RelationalTable hitToRotated) {
-        Double[] isolations = new Double[12];
+    public static Double[] getIsolations(Track trk, RelationalTable hitToStrips, RelationalTable hitToRotated, int layers) {
+        Double[] isolations = new Double[2*layers];
         for (TrackerHit hit : trk.getTrackerHits()) {
             Set<TrackerHit> htsList = hitToStrips.allFrom(hitToRotated.from(hit));
             TrackerHit[] strips = new TrackerHit[2];
@@ -1298,7 +1299,9 @@ public static Double[] getIsolations(Track trk, RelationalTable hitToStrips, Rel
         return isolations;
     }
    
-    
+    public static Double[] getIsolations(Track trk, RelationalTable hitToStrips, RelationalTable hitToRotated) {
+        return getIsolations(trk, hitToStrips, hitToRotated, 6);
+    }
     
     /**
      * Backward compatibility function for {@code extrapolateTrackUsingFieldMap}.