diff --git a/Projects/Dali/protonSingle.reaction b/Projects/Dali/protonSingle.reaction
index cf1f63939d811b52d92832c94f2104af8d755f2e..6e5ead539b6db5101109689fc2322131c53be365 100644
--- a/Projects/Dali/protonSingle.reaction
+++ b/Projects/Dali/protonSingle.reaction
@@ -11,7 +11,7 @@ Beam
  %0.5
  SigmaY= 0.01 
  %0.5
- MeanThetaX= 5
+ MeanThetaX= 0
  MeanPhiY= 0
  MeanX= 0
  MeanY= 0