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Hi, Greg,
Very sharp and clean as usual. Lovely job.
Like us, you found an almost perfect match between the distributions of the H-alpha and [OIII]. (There are just a couple tiny patches where the relative contribution of H-alpha is a bit higher than elsewhere)
That is encouraging from the scientific accuracy point of view, but also interesting in that it seems almost unique up there. We could have fun trying to guess why. Gives the image a very special and unusual look, like an ice sculpture.
Cheers,
MnT
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