diff --git a/script/RFscan/GunScan.py b/script/RFscan/GunScan.py
index e65a426..0ecf548 100644
--- a/script/RFscan/GunScan.py
+++ b/script/RFscan/GunScan.py
@@ -26,7 +26,8 @@ phase.initialize()
 camtool = Camtool("sflca:10000")
 camtool.startPipeline("simulated")
 camtool.startReceiver()
-x = camtool.getValue("x_fit_mean")
+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')