Thanks Guys.
Mike. Yes, well after fighting all day with Ha as green, I ditched it altogether.
Its nuts, Ha is Lumanence, but there is no Ha in the colour data!. Basically this just SII and OIII masked by Ha. I cant find any other pleasing combination without lots of green via Ha. Greens OK, but didnt suit this.
SII was difficult and didnt blend well with the normal Hubble pallete.
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