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Al,
I think you are correct, which is a relief as I was scratching my head trying to come up with a viable physical explanation. The fact that your H alpha/beta ratio is around four for your pink/AVI curve while mine is just over three made me wonder if my Ha was clipped, or in the non-linear zone. Turns out the latter is probably the case. I've not yet got around to determining the linear range of my new DSI Pro III ... but I think I exeeded it with my Ha!
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