Hue position → measured from the palette's neutral axis · lightness ↑. Colored lines are the lofted ramps with their steps (diamonds are off-curve steps); dashed grey lines are interior ramps, drawn but not lofted. Stippled where 1 generated step in 10 is expected to miss a hand-made one by more than two just-noticeable differences, or beyond the lightness range of the ramps on either side; hatched areas were clipped into the gamut.
at the same hue
Remove a real ramp, rebuild the surface without it, and compare what the generator produces with what the designers shipped.