Birks correction limited to 100 MeV

.idea/other.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="PySciProjectComponent">
+    <option name="PY_SCI_VIEW_SUGGESTED" value="true" />
+  </component>
+</project>
\ No newline at end of file

sixsutils.py

@@ -57,7 +57,10 @@ def birks_correction(energy):  # Birks coefficient and parameter estimates taken
     :return: Corrected energy in Mev
     """
     kbirks = 0.68E-3
-    return energy * (1 - scs.hyp2f1(1, 1 / 0.678, 1 + 1 / 0.678, -np.power(energy, 0.678) / (95 * kbirks)))
+    if energy > 100:
+        return energy
+    else:
+        return energy * (1 - scs.hyp2f1(1, 1 / 0.678, 1 + 1 / 0.678, -np.power(energy, 0.678) / (95 * kbirks)))
 
 
 def core_energy_to_64(energy):