Incredible geometry here. Remember these would be circles if the chart was scaled perfectly. Look at how the centers follow the blue trendlines...and here's what Liermann says "It's hard to tell by eye, but it looks like your major axis on the top elipses are following your top channel line, and some for the ones at the bottom. So your minor axis would almost always intersect your channel lines at a right angle"
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Robert24
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It's a fundamental theorem that when you have to parallel lines (like the channels you use), the shortest segment connecting them produces right angles... don't draw yourself in circles :) Liermam. He's got the physics degree. I just draw the lines.