Dual y-axes in Plot ?

How do you make dual y-axes in Plot ?

It’s not supported out of the box, but here are a few links showing possibilities:

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I find a useful design rule-of-thumb to be whenever contemplating a dual-axis chart, ask yourself whether two juxtaposed charts, or a connected scatterplot might be more effective. I’m not experienced with Plot, but it would appear both are possible.

Worth re-emphasising Lisa Charlotte Muth’s article on alternatives to dual-axis plots (also linked to in the Fil’s second post above):