emulating gnuplot's x2label/y2label

I want to plot two quantities on the same graph such that the X-axis
remains the same, while the left and right Y-axis show the ranges for
the first and second quanties respective. I fished through the demos
(shared_axes etc), the cookbook as well as the user manual, but
haven't been able to figure out a working example yet.

I hope this is easy to do, and if not, IMHO it should be made
relatively straight forward to make such plots since they are very
common with gnuplot users.



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