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From: Karl Ratzsch <mail.kfr@gmx.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: Can I increase the line width in the legend?
Date: Thu, 14 May 2020 21:15:14 +0200
Organization: solani.org
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Am 14.05.2020 um 13:38 schrieb Jean-Pierre Coulon:
> On Thu, 14 May 2020, Jörg Buchholz wrote:
> 
>> As a workaround you can use a "keyentry".
>>
>> plot sin(x) w l lt 1 t '',keyentry w l lw 4 lt 1 t 'sin(x)'
> 
> I have:
> 
> plot 'demo.txt' w l title "example",\
> 'demo.txt'  using 1:(2*$2) w l title "modif", keyentry w l lw 4 lt 1
> title "double
> 
> but it says: line5: undefined variable: keyentry
> 

"keyentry" is a new thing in gp5.4 (a second release candidate will
likely be out in a few days). It produces an entry in the legend
without plotting anything.