Useful comands to plot histograms:
gnuplot> set style data histograms
gnuplot> plot "random1.dat" using 2:xticlabels(1)
gnuplot> set boxwidth 0.9 relative
gnuplot> set style histogram clustered gap 0
gnuplot> set style fill solid
Some interesting examples:
http://objectmix.com/graphics/140008-gnuplot-histogram-has-large-spaces.html
If we don't want to show the key:
gnuplot>unset key
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