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Thanks everyone :-)
Mike, I'm a software developer by trade so code and formulas like the one I posted are pretty intuitive for me.
I've also been using PixInsight for a while now and have learned some things along the way, like that $T means "the image you're applying this to" and that you can apply things conditionally much like you would in excel by using the expression "iif(some condition, expression when true, expression when false)"
I had tried a couple of other approaches before settling on this one as the others had detrimental effects on SNR or other aspects... turns out this one was easier than the others as well as better.
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