diff --git a/script/optics/PhotonFluxSpectrum.py b/script/optics/PhotonFluxSpectrum.py
index bce34c8a..3e1b9e79 100644
--- a/script/optics/PhotonFluxSpectrum.py
+++ b/script/optics/PhotonFluxSpectrum.py
@@ -11,8 +11,8 @@ import time
 #RANGE = "G1200 full"
 #RANGE = "G600 full"
 RANGE = "C K-edge"
-#BEAM = "G1200 1x1"
-BEAM = "G1200 6x10"
+BEAM = "G1200 1x1"
+#BEAM = "G1200 6x10"
 
 if RANGE == "G600 full":
     # G600 full spectrum