I'd like to be able to show, on one plot, outputs by year that have different output ranges. As it is, the plot function nicely adjusts the graph to the most extreme output variable's range. I hope that plotted output lines can share an input timeline, and be graphed over the same 'page', yet have different y-ranges. Then, when running system dynamics' world3 model,  outputs like food per person per year, in hundreds of kilograms, will appear as changing when also plotting world population numbers per year, instead of just showing up as a horizontal line at the bottom of the graph.

In other words, wouldn't it be great if each plotted output variable could have it's own y-coordinate axis, while sharing compatible x-coordinate axes. The goal here is overlaying curves with orders-of-magnitude different output ranges automatically, so that the eye can compare rates of change of outputs.

Just a thought.