Finally, plot those adjusted readings on your M-L graph. Doing so has no relevance to your mirror's figure. Essentially, you are adjusting the plot in the same way that re-focusing adjusts the intercepted cone of light from your finished mirror. The M-L graph plots the slope of the surface at a given zone. Here's where the M-L method shines.
Interpretation is easy.
If your readings fall between the upper and lower limits across all zones, your mirror is good enough. If it falls outside of the tornado at any zone, that zone needs work. Of course, you want your readings to not only be within the tornado, but you want them to be as smooth and closely matched to the shape of the perfect parabola as possible. A saw-toothed mirror might fall within the tornado yet still give poor performance under the stars. This type of plot is very instructive.