diff --git a/script/RFscan/GunScan.py b/script/RFscan/GunScan.py
index c76d059..49f19f7 100644
--- a/script/RFscan/GunScan.py
+++ b/script/RFscan/GunScan.py
@@ -34,8 +34,8 @@ check_camtool()
 camtool.start("SINBD01-DSCR010")
 wait_camtool_message()
 
-x   = camtool.stream.getChild("gr_x_fit_mean")
-dx  = camtool.stream.getChild("gr_x_fit_standard_deviation")
+x   = camtool.stream.getChild("x_fit_mean")
+dx  = camtool.stream.getChild("x_fit_standard_deviation")
 
 try:
     xb  = create_averager(x,  nb, -1)    # -1 event based, waits for the next value
@@ -44,7 +44,7 @@ try:
     r = lscan(phase, [xb, dxb], start, stop, step , latency=lat)
     rf_phase = r.getPositions(0)
     E   = [energy0 * (1 + val.mean / 1e6 / disp) for val in r.getReadable(0)]
-    dE  = [energy0 * (    val.mean / 1e6 / disp) for val in r.getReadable(1)]
+    dE  = [energy0 * (    val.mean / 1e6 / abs(disp)) for val in r.getReadable(1)]
 finally:
     phase.write(phase0)
     phase.close()