diff -u -r1.6 -r1.7
--- compact.xml	13 Oct 2011 20:31:24 -0000	1.6
+++ compact.xml	13 Oct 2011 20:54:45 -0000	1.7
@@ -6,13 +6,6 @@

         <comment>HPS Test Proposal detector</comment>
     </info>
 

-    <!-->
-       Changes since v3.0:
-		 Redefined "Air" to be a very low density gas (vacuum). 
-		 Updated box dipole geometry to match what is described 
-		 in the HPS Test proposal.
-	 -->
-

     <define>
         
         <!-- world -->

@@ -53,15 +46,7 @@

     </define>
     
     <materials>

-
-
-        <material name="Air">
-           <D type="density" unit="g/cm3" value="0.0012"/>
-			  <fraction n="0.754" ref="N"/>
-           <fraction n="0.234" ref="O"/>
-			  <fraction n="0.012" ref="Ar"/> 
-		  </material>
-

+        

         <material name="LeadTungstate">
             <D value="8.28" unit="g/cm3"/>
             <composite n="1" ref="Pb"/>

@@ -157,10 +142,10 @@

                name="AnalyzingDipole"
                x="0*cm"
                y="0*cm"

-               z="45.22*cm"
-               dx="22.86*cm"
-               dy="7.62*cm"
-               dz="46.22*cm"

+               z="50*cm"
+               dx="10*cm"
+               dy="10*cm"
+               dz="51*cm"

                bx="0.0"
                by="-0.5"
                bz="0.0">