question about legends

I have a main routine that calls a subroutine twice. In the subroutine,
a plot is drawn. If the active figure is the same, both plots are shown
at the same time in the same figure. The problem is that both plots
have legends, and it appears as if a figure can only have one legend,
so one of the legends is overwritten (the first). The question is, what
is the best way to get the legends to be appended so that all graph
lines have legends.



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