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star colour in NB is meaningless, so duplicate the ha layer then delete the stars in each of the other OIII SII Ha layers, duplicate the starless Ha channel. then apply a difference filter between the duplicated Ha layer with stars and the duplicated Ha layer without stars and you will have only small Ha stars in that channel. Make that star only channel white (with zero hue or make mono or whatever if not already white) and you end up with 3 starless channels and another channel just with small white stars. blend to taste. OIII stars are always bigger than Ha stars which causes fringing.
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