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Hi, Andy,
Thanks for posting the separate Ha and SII. I agree totally with your comments and observations. I went back and had a look at our shot of the same area, making a bicolour Ha/SII shot, and being careful to process them linearly so I didn't introduce any false differences with curves. They are indeed remarkably similar, except perhaps in the very faintest regions, and that could be just limits of knowledge about the zero point.
Best,
Mike
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