Hi all,
I am trying to put in the same graph two graphs
constructed using fpfit (Twoway fractional-polynomial
prediction plots) and the by() option:
when I use the following command:
twoway (fpfit y x , sort), by(z , style(default)
noxrescale noyrescale) 
the graphs appear side by side, instead of both in the
same graph, despite they both have the same scale.
Can somebody help me out? 
thanks,
Julio
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