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From: Karl Ratzsch <mail.kfr@gmx.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: How to plot a vertical line in GNUPLOT, say x=3.
Date: Tue, 20 Nov 2018 15:38:37 +0100
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Am 17.11.2018 um 15:18 schrieb Gavin Buxton:
> plot (x<3?-10:10)
> 

nice, but not perfectly vertical ;-)

   plot "+" us (3):(x<3?-10:10) w l

otherwise

  set arrow 1 nohead from 3,-10 to 3,10