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Makes sense. Sorry, Ken, I wasn't trying to be difficult :-). My head is spinning from all the stuff I've been reading about this. Just trying to account for why there might be different measurements of velocity between you and Malc.
I've just been reading Steve Shore's "Spectroscopy of Novae - a users manual". He talks about changes in he ejecta velocity, but also changes in what parts of the ejecta become visible owing to changes in the optical thickness of the ejecta with different phases ... I can't pretend I understand all he's saying!
But I liked the bit where he said to take a look at YouTube videos of slo-motion explosions of Hydrogen bombs to get a general idea :-)
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