How to create stacked area graphs with Gnuplot

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http://www.linux.com – If you tell gnuplot to plot those numbers as simple lines they'll continuously overlap, making hard to see quickly which is higher in each moment, or how they all add up. I find that stacked filled graphs like the one here are much easier to understand, but I couldn't find how to do them with Gnuplot. Until now that is. I have put the Gnuplot command and auxiliary script to plot diagrams like this here. (General)