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g day Mike,
i add my thanks for posting another great capture and for the explanations.
i was surprised (i am but a novice) to see the very square edge to the dust in the swan's throat, and other softer squares around its head and at its up-swept tail. so far when i have observed the throat seems smoothly curved.
the squareness reminded of an article "Spider Webs in Space" by Robert Zimmerman in AS&T January 2015 with particular reference to the Red Rectangle, but i dunno if the connection is a valid one.
cheers, L
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