+1  A: 
tom10  2009-10-29 15:03:33
Thanks Tom, this is a sensible approach, but I'd rather have the values automatically computed, because I'll be plotting several different functions with different value ranges. If there are no further responses, I'll go with this solution and compute the values myself by finding the min and max values among all arrays.
Roberto Bonvallet  2009-10-29 15:49:36
That's just a small change. I'll update my answer.
tom10  2009-10-29 16:02:16
Thanks! I had overlooked the `levels` attribute. Now it works :)
Roberto Bonvallet  2009-10-30 13:47:54

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