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From: sfeam <sfeam@users.sourceforge.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: yaxis max of "at least" some value
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Date: Wed, 16 May 2012 16:26:59 -0700
Organization: gnuplot development team
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Bryan wrote:

> I'm trying to get the Y axis to always show at least 120.  If the Y
> values are greater than 120, then there is no problem, but if they are
> less than 120, I would like the graph to at least always show 120 on
> the Y axis.
> 
> I have tried messing around with min/max of autoscale, and writeback,
> but neither seem to do what I want.

See "help set xrange"
You want something like

    set yrange [ * ; 120 < * ]

This option is new to version 4.6, so if you have an older gnuplot it 
won't help.