diff --git a/csaxs_bec/bec_ipython_client/plugins/cSAXS/intensity_map_predict_gap.py b/csaxs_bec/bec_ipython_client/plugins/cSAXS/intensity_map_predict_gap.py
index e991ba7..dbdc992 100755
--- a/csaxs_bec/bec_ipython_client/plugins/cSAXS/intensity_map_predict_gap.py
+++ b/csaxs_bec/bec_ipython_client/plugins/cSAXS/intensity_map_predict_gap.py
@@ -5,7 +5,7 @@ import numpy as np
 
 
 def predict_gap(energy, n=3, gap_min=5.0,
-                E_inf=3.83167, c0=3.1133, c1=-0.644678, c2=0.0210398):
+                E_inf=3.2878, c0=2.46086, c1=-0.468091, c2=0.0):
     """Undulator gap [mm] to place `energy` [keV] on harmonic `n`.
     Fitted constants are the defaults below; edit them to retune.
     Returns NaN where the energy is unreachable on that harmonic."""