diff -u -r1.2 -r1.3
--- AbstractCylindricalTracker.java	30 Nov 2010 00:16:29 -0000	1.2
+++ AbstractCylindricalTracker.java	19 Jan 2012 12:43:54 -0000	1.3
@@ -6,7 +6,7 @@

 
 /**
  * @author Jeremy McCormick <[log in to unmask]>

- * @version $Id: AbstractCylindricalTracker.java,v 1.2 2010/11/30 00:16:29 jeremy Exp $

+ * @version $Id: AbstractCylindricalTracker.java,v 1.3 2012/01/19 12:43:54 grefe Exp $

  */
 abstract class AbstractCylindricalTracker extends AbstractTracker implements CylindricalSubdetector
 {

@@ -32,7 +32,14 @@

 
         rmin = dimensions.getAttribute( "inner_r" ).getDoubleValue();
         zmax = dimensions.getAttribute( "outer_z" ).getDoubleValue();

-        zmin = -zmax;

+        if ( dimensions.getAttribute( "inner_z" ) != null )
+        {
+            zmin = dimensions.getAttribute( "inner_z" ).getDoubleValue();
+        }
+        else
+        {
+        	zmin = -zmax;
+        }

         rmax = rmin + getLayering().getLayers().getTotalThickness();
         getLayering().setOffset( rmin );
     }