[plt-scheme] Is it possible to draw a vertical line using plot?

From: geb a (geb_a at yahoo.com)
Date: Wed Jan 9 16:03:36 EST 2008

I assume that it is, but I'm having trouble seeing how
it might be done from the documentation.  I would like
to give an x value and have the program draw a
vertical between ymin and ymax.

Thanks ahead of time for your help.



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