diff --git a/script/XPSSpectrum.py b/script/XPSSpectrum.py
index 67e1c2cc..c99e64a4 100644
--- a/script/XPSSpectrum.py
+++ b/script/XPSSpectrum.py
@@ -54,7 +54,7 @@ def get_binding_range():
         ephot = ehi
     eb1 = ephot - elo - workfunc
     eb2 = ephot - ehi - workfunc
-    return eb2, eb1
+    return eb1, eb2
 
 
 eb2, eb1 = get_binding_range()