Resolve "Implement ce_GEM"

Closes #11 (closed)

compact/ce_GEM.xml

@@ -19,7 +19,7 @@
       <dimensions rmin="ce_GEM_rmin" rmax="ce_GEM_rmax" length="ce_GEM_length"/>
       <position x="ce_GEM_x_pos" y="ce_GEM_y_pos" z="ce_GEM_z_pos"/>
       <layer repeat="ce_GEM_layer" vis="ce_GEM_layerVis">
-        <slice name="Ar10C02_slice" material="Ar10CO2" sensitive="true"/>
+        <slice name="Ar10CO2_slice" material="Ar10CO2" thickness="ce_GEM_layer_thickness" sensitive="true"/>
       </layer>
     </detector>
   </detectors>