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From: =?UTF-8?Q?Hans-Bernhard_Br=c3=b6ker?= <HBBroeker@t-online.de>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: can I fit two columns when I use timefmt
Date: Wed, 25 Oct 2017 01:01:40 +0200
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Am 24.10.2017 um 13:30 schrieb Jean-Pierre Coulon:
> I have a datafile with lines like 171023_15h11m59s150 <value2> <value3>.
> I know how to plot columns 2 and 3 using set xdata time; set timefmt
> "%y%m%d_%Hh%Mm%Ss"

Those two sentences (with the context you added in your reply) 
contradict each other.  Either that's not actually what your lines look 
like, or you're not plotting them using the plot command you say you are.

I think it's time you change from "lines like" to you showing some or 
all of your actual data lines, and from "I know how to" to "this is the 
actual command sequence I use", otherwise there's no way to help you 
meaningfully.