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Been late to reply because I've been wanting to use linear regression to see what the SII says independently of the Ha, but got tied up with our supernova, and still haven't done it.
Your heroic 15 hours confirms that there isn't a lot of really strong or really sharp edged stuff in SII, as might be the case if this area had experienced recent supernovas. It's all gentle and calm.
Top stuff, Marc, well done.
Best,
Mike
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