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From: =?UTF-8?B?SGFucy1CZXJuaGFyZCBCcsO2a2Vy?= <HBBroeker@t-online.de>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: This ought to be easy!
Date: Thu, 04 Apr 2013 18:55:41 +0200
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On 04.04.2013 13:17, Mark Scott wrote:
> I am using commands such as this:
> set yrange [0:5]
> set xdata time
> set timefmt "%H:%M"
> set format x "%H:%M"
> set xrange ["00:00":"24:00"]
> plot "./2012-06-15.dat" with lines
>
> I am being thwarted by the message "Need full using spec for x time data".

So how about you do what the message asks you to: give it a using 
spec(ification), as explained in 'help using'?