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With the known proportion of each and the diagonal measure, I figured out the 20" is around 17" x 10", the 22" around 18.47" x 11.82" and the 23" close to 19.5" x 12.2"...
Not preccise calculations but close enough to give you an idea.
Thanks for doin' the math, Jerome. If correct, those dimensions of the 20" CD mean that full 11x17" spread is a no-go. Let's see how close your approximations are when some 20/22/23" owners check in w/tape measures in hand.