Here I’ve modified the code to not only accept extra axes, but also to be able to place them on either side of the plot area. This is reflected in the location of the tick and axis labels relative to the axis locations (in both the x and y directions) and the meaning of the “in” vs. “out” setting of the tick marks, all of which are presently set to “out” rather than “both” as they have been.
Next I’ll review how the rotations work from the other side. That should be a bit more involved.
