diff --git a/script/RFscan/GunScan.py b/script/RFscan/GunScan.py
index 56d578a..bab94b4 100644
--- a/script/RFscan/GunScan.py
+++ b/script/RFscan/GunScan.py
@@ -2,11 +2,11 @@ import  ch.psi.pshell.epics.ControlledVariable as ControlledVariable
 import  ch.psi.pshell.epics.Camtool as Camtool
 
 if get_exec_pars().source == CommandSource.ui:
-    start   = -180.0
-    stop    = 180.0
-    step    = 20.0
+    start   = 55.0
+    stop    = 75.0
+    step    = 2.0
     nb      = 5
-    lat     = 1.0
+    lat     = 0.5
     disp    = caget("SINBD01-DSCR010:DISPERSION-SIM")
     energy0 = caget("SINBD01-DSCR010:ENERGY-SIM")
 else: