/usr/share/gnuplot/gnuplot/4.6/colors_mono.gp is in gnuplot-qt 4.6.4-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | #
# Provide a consistent set of four distinguishable
# black line types.
# NB: This does not work with "set term post mono"
#
set termoption dashed
unset for [i=1:4] linetype i
set linetype 4 lt 1 lw 2.5 lc rgb "black"
set linetype 3 lt 3 lw 1 lc rgb "black"
set linetype 2 lt 2 lw 1 lc rgb "black"
set linetype 1 lt -1 lw 1 lc rgb "black"
set linetype cycle 4
#
set palette gray
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