[Gnuplot-info] Short horizontal line become exaggerated in saved plots

[Rob S. <rob...@ut...>]

Hoping third times the charm, with this posting.  My first was rejected 
as not-a-member, the second seems to have simply wafted away...

I'm running gnuplot 4.2 patchlevel 6 on RHEL 6.6.

I draw a number of (usually quite short) lines 4pt thick throughout the 
plot. In the interactive window these are so short they are often barely 
visible (and that's a good thing). But they become exaggerated in the 
(viewing of) the saved plot, using jpeg, png or gif.

My line style for these is: set style line 4 linewidth 4 lc rgb "#8550FF"

each of them is plotted from a generated file of this form:

    1    23057190    2.709457    0.000000    23057190
    1    24552835    2.709457    0.000000    24552835

with this directive:

    plot ... redo/1801/wpw/runAvgRatio.0163257164" using 2:3 title ""
    axes x1y2 ls 4 with line [,another/file]*

and there are hundreds of them. the X values are base position on a 
chromosome scaled to full genome (0..3,000,000,000)

I view the saved images in either emacs (I know) or gimp or "eye of 
GNOME" and see the same bloat.

Does anyone have an explanation, or better yet a solution?

Happy to ship my plotable file, but keep in mind it references lots of 
the line files.