diff --git a/script/RFscan/GunScan.py b/script/RFscan/GunScan.py
index 34afdea..b64be12 100644
--- a/script/RFscan/GunScan.py
+++ b/script/RFscan/GunScan.py
@@ -28,8 +28,8 @@ phase.initialize()
 #camtool.startReceiver()
 #x  = camtool.getValue("x_com")
 #dx = camtool.getValue("x_rms")
-x   =  Channel("SINEG01-RSYS:GET-VSUM-AMPLT-SIM", type = 'd', alias='Amplitude Readback')
-dx  =  Channel("SINEG01-RSYS:GET-KLY-POWER-SIM",  type = 'd', alias='Power Readback')
+x   =  phase
+dx  =  (phase - 85)**2
 
 
 try:
@@ -41,6 +41,6 @@ try:
     dE  = [val.mean/1000.0/disp*energy0 for val in r.getReadable(1)]
 finally:
     phase.close()
-    camtool.close()
+#    camtool.close()
     
 p = plot([E, dE],"data", rf_phase, title="Phase scan")[0]