diff --git a/wetb/prepost/Simulations.py b/wetb/prepost/Simulations.py
index 732b03df5c0cf122c121064e3b62e1197bd61f12..75610151df5d55a6f073eeb1e06698af7f6e7b6e 100755
--- a/wetb/prepost/Simulations.py
+++ b/wetb/prepost/Simulations.py
@@ -4942,7 +4942,7 @@ class Cases(object):
             upper = np.concatenate((np.array([ch1[indmax:],ch2[indmax:]]).T,\
                             np.array([ch1[:indmin+1],ch2[:indmin+1]]).T),axis=0)
         else:
-            upper = np.array([ch1[indmax:indmin+1,:],ch2[indmax:indmin+1,:]]).T
+            upper = np.array([ch1[indmax:indmin+1],ch2[indmax:indmin+1]]).T
             lower = np.concatenate((np.array([ch1[indmin:],ch2[indmin:]]).T,\
                                 np.array([ch1[:indmax+1],ch2[:indmax+1]]).T),axis=0)