Hi Edward.I wonder why range objects in relax by default are created asxrange objects?I think this is related to the error when importing matplotlib.from pylab import *-------relax> M31=range(10)relax> type(M31)<type 'xrange'>relax> print M31[:7]Traceback (most recent call last):File "<console>", line 1, in <module>TypeError: sequence index must be integer, not 'slice'-----BestTroels