st: graph matrix by(x, norescale) doesn't work

[David Airey <david.airey@Vanderbilt.Edu>]

I can't seem to get the scale to remain the same for subgroups when  
using

graph matrix x1 x2 x3, by(y, norescale) half

That is I can't get the axis the stop scaling independently in my by  
groups. I must be doing something stupid.
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