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Gnuplot Stacked Bar Graph in Black and White

I am trying to print a complex histogram from gnuplot to black and white png. By this, I mean that I would like every area in the bar to be embroidered or checked next to the side legend; thus, when they are printed, people can still identify regions. I tried the following, but it just leaves me with big black drops!

set term pngcairo mono   size 750, 300
set output \"pies/interesting.png\"
set style data histograms
set style histogram rowstacked
set boxwidth 1 relative
set style fill solid 1 border -1
set yrange [0:100]
set ytics 10
set datafile separator \",\"
plot './functions-$MODE.csv.t' using 1 t \"\", for [i=9:13] '' using (100.*column(i)/column(15)) ti column(i)

How to make my areas hatch?

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.... , , , : , : http://gnuplot.sourceforge.net/demo/fillstyle.html , : " ":

set term pngcairo mono size 750, 300
set output \"pies/interesting.png\"
set style data histograms
set style histogram rowstacked
set boxwidth 1 relative
set style fill pattern border
set datafile separator \",\"
plot './functions-$MODE.csv.t' using 1 t \"\", for [i=9:13] '' using (100.*column(i)/column(15)) ti column(i)

.

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