diff -u -r1.5 -r1.6
--- compact.xml	15 Sep 2011 21:22:27 -0000	1.5
+++ compact.xml	13 Oct 2011 20:31:24 -0000	1.6
@@ -6,6 +6,13 @@

         <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 -->

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

     </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"/>

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

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

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

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

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

diff -u -r1.2 -r1.3
--- detector.properties	31 Aug 2011 00:30:22 -0000	1.2
+++ detector.properties	13 Oct 2011 20:31:24 -0000	1.3
@@ -1 +1 @@

-name: HPS-Test-JLAB-v3pt0

+name: HPS-Test-JLAB-v3pt1