[racket] Keeping DrRacket from closing plot window

In DrRacket I'm generating some  simulations using the random function and
plotting the results using the Racket Plot routines.  I put the plot
results in a new window using "(plot-new-window? #t)". This works fine but
everytime I run a new simulation  within DrRacket the previous plot window
is closed.

Is there a way to keep DrRacket from closing the open plot window each time
I run a new simulation.

Thanks,
Harry Spier
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