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A direct explanation is always better than a guess. Especially mine.
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I think we're all bozos on this bus.
I see it as a localized feature at the interface between the (more or less stagnant) wake and fast-moving air. In this case the fast moving air is in the diffuser. I wonder why it isn't inverted. It would be easy enough to test both orientations.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.What the headline giveth, the last paragraph taketh away. -- Scott Ott
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