diff -u -r1.10 -r1.11
--- MaterialManager.java	11 Apr 2011 17:21:07 -0000	1.10
+++ MaterialManager.java	12 Apr 2011 18:00:16 -0000	1.11
@@ -37,8 +37,11 @@

  * Rewrite and refactor of Rich's {@link MaterialManager} class to handle Subdetector types. 
  * This class should now group together SiTrackerEndcap2 layers correctly.
  * 

+ * @author Rich Partridge

  * @author Jeremy McCormick

- * @version $Id: MaterialManager.java,v 1.10 2011/04/11 17:21:07 mgraham Exp $

+ * @author Matt Graham
+ *
+ * @version $Id: MaterialManager.java,v 1.11 2011/04/12 18:00:16 jeremy Exp $

  */
 public class MaterialManager
 {

@@ -200,27 +203,24 @@

      */
     public MaterialManager()
     {

-        // Barrel VolumeGrouper.
-        SubdetectorVolumeGrouper barrelGrouper = new BarrelLayerVolumeGroup();
-
-        // Add VolumeGrouper for tracker barrel types.

+        // Barrels.
+        SubdetectorVolumeGrouper barrelGrouper = new BarrelLayerVolumeGroup();       

         subdetGroups.put(SiTrackerBarrel.class, barrelGrouper);
         subdetGroups.put(MultiLayerTracker.class, barrelGrouper);
         

-        // Add default endcap VolumeGrouper.

+        // Endcaps.

         SubdetectorVolumeGrouper endcapGrouper = new EndcapVolumeGrouper();
         subdetGroups.put(SiTrackerEndcap.class, endcapGrouper);
         subdetGroups.put(DiskTracker.class, endcapGrouper);
 

-        // Add VolumeGrouper for SiTrackerEndcap2 and SiTrackerFixedTarget2.
-        SubdetectorVolumeGrouper endcapGrouper2 = new SiTrackerEndap2VolumeGrouper();
-        subdetGroups.put(SiTrackerEndcap2.class, endcapGrouper2);
-        subdetGroups.put(SiTrackerFixedTarget2.class, endcapGrouper2);
-        SubdetectorVolumeGrouper fixedtargetGrouper = new SiTrackerFixedTarget2VolumeGrouper();
-        subdetGroups.put(SiTrackerFixedTarget2.class, fixedtargetGrouper);

+        // SiTrackerEndcap2.
+        subdetGroups.put(SiTrackerEndcap2.class, new SiTrackerEndap2VolumeGrouper());
+        
+        // SiTrackerFixedTarget2.
+        subdetGroups.put(SiTrackerFixedTarget2.class, new SiTrackerFixedTarget2VolumeGrouper());

-        // Add VolumeGrouper for PolyconeSupport.
-        subdetGroups.put(PolyconeSupport.class, new PolyconeSupportVolumeGrouper());        

+        // PolyconeSupport.
+        subdetGroups.put(PolyconeSupport.class, new PolyconeSupportVolumeGrouper());

     }
     
     /**