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I'd bet that the gray shading represents plan taper and the others are flat-sided.
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You mean taper as viewed from above? I think you are right, because the top pic has no taper anywhere, and the next one (and following) investigates the change of a single factor, the top angle. I think so, anyway. Maybe aerohead can confirm.
Good point about curving the panels, and it also reduces the transition problem. I have an idea how to do that, so I will try to put at least a small curve into them.