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From: Karl Ratzsch <mail.kfr@gmx.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: Best fit point in contour plots using Gnuplot
Date: Mon, 19 Nov 2018 14:51:36 +0100
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Am 19.11.2018 um 09:20 schrieb srishtinagu19@gmail.com:

> Can someone please tell me how to make a best fit point in a contour plot
> I am trying-
>  $splot "test1.dat" with lines "<echo '135 0.40'"

What gave you the idea that this could work? ;-)

> But it is showing an error.
> I want a point at 135,0.40

Two possiblities

   set object 1 ellipse at 134,0.4 size 2,2 units xx

or

   set label 1 "" at 135,0.4 point pt 3 ps 2

followed by your (s)plot command