diff --git a/CMakeLists.txt b/CMakeLists.txt
index fa0a82b7367c7425b5a0c1783fd1ffa40ba43c85..209c89a1bb5a742a1bb5acf8934456eb3a137bbd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,17 +5,11 @@ find_package( DD4hep REQUIRED COMPONENTS DDCore DDG4 )
 
 #-----------------------------------------------------------------------------------
 set(a_lib_name my_detector)
-#dd4hep_package (${a_lib_name} MAJOR 0 MINOR 0 PATCH 1
-#    USES         [ROOT   REQUIRED COMPONENTS Geom GenVector] 
-#                 [DD4hep REQUIRED COMPONENTS DDCore DDRec]
-#    OPTIONAL     XERCESC
-#    INCLUDE_DIRS include
-#    )
 dd4hep_add_plugin(${a_lib_name} SOURCES src/*.cpp
-  #USES ActsCore ActsPluginDD4hep
   )
 target_link_libraries(${a_lib_name}
   PUBLIC DD4hep::DDCore  DD4hep::DDRec
+  #ActsCore ActsPluginDD4hep
   )
 
 #-----------------------------------------------------------------------------------
diff --git a/gem_tracker.xml b/gem_tracker.xml
index 2c874ea59613ee91a29b13c5b621c09e58fca13e..6c72f93f1cc494b983fd3cd2de9026ef9b5e511a 100644
--- a/gem_tracker.xml
+++ b/gem_tracker.xml
@@ -79,26 +79,26 @@
     </detector>
 
     <detector id="2" name="GEMTracker" vis="RedVis" type="my_GEMTracker" readout="GEMTrackerHits" > 
-      <layer id="1" z="-100 *cm" inner_r="36*cm"  outer_r="87.0*cm"  phi0_offset="0.0*deg" />
-      <layer id="2" z="-80 *cm" inner_r="21*cm"  outer_r="98.0*cm"  phi0_offset="0.0*deg" />
-      <layer id="3" z="-60 *cm" inner_r="25*cm"  outer_r="112.0*cm" phi0_offset="0.0*deg" />
-      <layer id="4" z="-40 *cm" inner_r="32*cm"  outer_r="135.0*cm" phi0_offset="0.0*deg" />
-      <layer id="5" z=" 40 *cm" inner_r="42*cm"  outer_r="100.0*cm" phi0_offset="0.0*deg" />
-      <layer id="6" z=" 60 *cm" inner_r="42*cm"  outer_r="100.0*cm" phi0_offset="0.0*deg" />
-      <layer id="7" z=" 80 *cm" inner_r="42*cm"  outer_r="123.0*cm" phi0_offset="0.0*deg" />
-      <layer id="8" z="100 *cm" inner_r="42*cm"  outer_r="123.0*cm" phi0_offset="0.0*deg" />
+      <layer id="1" z="-100 *cm" inner_r="40*cm"  outer_r="120*cm"   phi0_offset="0.0*deg" />
+      <layer id="2" z="-80 *cm"  inner_r="30*cm"  outer_r="90*cm"    phi0_offset="0.0*deg" />
+      <layer id="3" z="-60 *cm"  inner_r="20*cm"  outer_r="70*cm"    phi0_offset="0.0*deg" />
+      <layer id="4" z="-40 *cm"  inner_r="20*cm"  outer_r="50.0*cm"  phi0_offset="0.0*deg" />
+      <layer id="5" z=" 40 *cm"  inner_r="20*cm"  outer_r="50.0*cm" phi0_offset="0.0*deg" />
+      <layer id="6" z=" 60 *cm"  inner_r="25*cm"  outer_r="70.0*cm" phi0_offset="0.0*deg" />
+      <layer id="7" z=" 80 *cm"  inner_r="30*cm"  outer_r="90.0*cm" phi0_offset="0.0*deg" />
+      <layer id="8" z="100 *cm"  inner_r="40*cm"  outer_r="100.0*cm" phi0_offset="0.0*deg" />
     </detector>
 
   </detectors>
 
   <readouts>
     <readout name="GEMTrackerHits">
-      <!--
       <segmentation type="CartesianGridXY" grid_size_x="1*cm" grid_size_y="3*cm" />
       <id>system:8,barrel:2,layer:4,module:12,sensor:2,x:32:-16,y:-16</id>
-      -->
+      <!--
       <segmentation type="PolarGridRPhi" grid_size_phi="3.0*degree" grid_size_r="5.0*cm"/>
       <id>system:5,barrel:3,layer:4,module:5,r:32:-16,phi:-16</id>
+      -->
     </readout>
   </readouts>