Plotting multiple histograms

Rather than stacking the histograms, you can plot them side by side. The following figure shows the same data as in the previous plot, but has two separate sets of histograms plotted beside each other:

To make room, the histogram boxes are automatically drawn thinner. The different data sets are distinguished by different fill colors or patterns, depending on terminal, and/or different styles for the lines delineating the histogram boxes.

set style fill solid 1.0 border lt -1
set style data histograms
plot [0:40] 'parabolaCircles.text' using (-$2),\'' using (20*$3) notitle