As an alternative to the average-angle line, a specific angle could be marked with a triangle that is placed just outside the plot edge whose corner points to this angle.
There will be overlap conflicts with the 95% CI line and the scale bar that need to be taken care of, though.
As an alternative to the average-angle line, a specific angle could be marked with a triangle that is placed just outside the plot edge whose corner points to this angle.
There will be overlap conflicts with the 95% CI line and the scale bar that need to be taken care of, though.