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From: sfeam <sfeam@users.sourceforge.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: Setting line width increases line length
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Date: Mon, 18 Feb 2013 10:23:16 -0800
Organization: gnuplot development team
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Ivan K. wrote:
> However, in the top line, I have set the line
> width to "7" but not only does this increase
> the width of the line (something I want)
> but increasing the width increases the _length_
> of the line too (something I do not want).

You are referring to the treatment of line segment ends
("end caps"). The options are conventionally called "butt", 
"square", and "round".  See here, for example:

    http://i.stack.imgur.com/xCRe3.png

Gnuplot's pngcairo terminal lets you choose between
"butt" or "round".  "square" is not currently supported.
It sounds like you want 
    set terminal pngcairo butt
 
> In the example, even though the data for
> both lines begins at x=10 and ends at x=20, the
> top line is longer.
> 
> 
> Can I increase the width of a line without
> increasing the length?
> 
> Thank you for your help;
> 
> 
> 
> ::::::::::::: line_width_01.com :::::::::::::
> 
> set term pngcairo enhanced size 400, 200
> 
> set output 'line_width_01.png';
> set nokey;
> set origin 0.0, 0.0;
> 
> plot [ 0 :30 ][ 0: 50 ] \
>      'line_width_01_01.dat' with lines lw 1, \
>      'line_width_01_02.dat' with lines lw 7
> 
> ::::::::::::: line_width_01_01.dat :::::::::::::
> 
> 10      23
> 20      23
> 
> 
> ::::::::::::: line_width_01_02.dat :::::::::::::
> 
> 10      27
> 20      27