I read everything.
I take "Distance from the sharpening edge" to be a vertical distance, from the edges at the bottom of the blade.
And I therefore finally took the dotted vertical line to represent the height where the chrome relief starts - i.e., 3 mm above the current edge bottoms - which roughly matches the caliper measurement you show.
That's correct?
In which case, all three solid measurement lines (inner edge, outer edge, and middle) appear to drop fairly abruptly around 7 mm above the bottom of the edges - which is 4 mm above the top of the chrome relief zone. Correct?
My interpretation of that is that the concern that many people have, that they cannot sharpen past the chrome relief zone, because they think the steel is only hard at the heights where the chrome is removed, is wrong; they have another 4 mm or so of hardened steel - as long as they do their own chrome relief.
Of course, doing your own chrome relief well would be pretty hard - you'd want to remove similar amounts of metal on both sides of the blade in a uniform fashion, along the whole length of the blade, or you wind up with a weird blade shape. I'm not sure anyone without a high precision machine shop could do that in a uniform fashion. I probably couldn't - unless there is a way to file away the plating without removing some of the steel.
BTW, Mike Cunningham once told me that according to his measurements, MK didn't always plate symmetrically - i.e., the thickness of the nickel/chrome plating wasn't always the same on both sides. I'm not sure that matters, unless you use the sides of the blade in the plated zone to center the grinding wheel.