On Jan 31, 2012, at 2:49 PM, Jason Grout wrote:

> Thanks.  The problem is that you are only plotting the planes from z=-3 to 
> z=3.  Try changing the z range to -10,10 and the planes will extend further.

Wow.  Sorry to waste everyone's time.  The z-values of 3 versus 18 appearing in 
the plots should have been obvious to me.  Jason, thanks.

Dana

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