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From: hectorratia@gmail.com
Newsgroups: comp.graphics.apps.gnuplot
Subject: Horizontal grid not displaying properly
Date: Tue, 12 Jun 2012 01:37:10 -0700 (PDT)
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This image shows the problem:
http://s13.postimage.org/qu0f6r2l3/COMPexp02.png
The dashes of the horizontal grid are deformed.

The script used to plot it is:

set term png size 800,500 20
set out 'temp.png'

set style line 11 lc rgb '#808080' lt 1 lw 4
set border ls 11
set tics front nomirror
set style line 12 lc rgb '#808080' lt 0 lw 3
set grid back ls 12

set xlabel "t  (s)"
set ylabel "h (mm)"
set key right top
set key box linestyle 1

plot 'DATOS/upZZZ.out' using (($1-1)/30):($2*10) with line lw 2 lc rgb '#54=
BC00' title 'Exp Up', 'DATOS/downZZZ.out' using (($1-1)/50):($2*10) with li=
ne lw 2 lc rgb '#CEEA82' title 'Exp Down','YYY/XXX/volcadosondas_h.out' usi=
ng 1:($2*1000) with line lw 2 lc rgb '#EF2B2D' title 'BHL Up','YYY/XXX/volc=
adosondas_h.out' using 1:($3*1000) with line lw 2 lc rgb '#F9B2B7' title 'B=
HL Down','YYY/UUU/volcadosondas_h.out' using 1:($2*1000) with line lw 2 lc =
rgb '#007AA5' title 'BT Up','YYY/UUU/volcadosondas_h.out' using 1:($3*1000)=
 with line lw 2 lc rgb '#99D6DD' title 'BT Down'


Any idea about how to fix the grid?