See the Notes above.

"After a basic 2-point grayscale calibration I to wrangle the 10-point system to improve gamma and grayscale, but found myself running out of range in at some levels to try to compensate for gamma variations. Unfortunately, looking at program material afterward I noticed color banding, specifically magenta in near-white areas, which disappeared when I switched the 10-point adjustments Off completely. For that reason I ended up skipping it."