Includes provision of "right" axis components, and using them for the alternate y-axis width, decorate and tick-formatting options.

Column chart needs to blank-out instead of filter the data for each y-axis, and also needs to harmonise the origin of the domain on each side (to make the bars line up).

If you clicked on the legend to hide the series that is in the right-hand y-axis, the domain-match function would actually break the left-hand domain, causing a load of console errors (and the left-hand series wouldn't display).