Yes Rick, since revised, found it very hard with so much damned signal! Balanced a fair bit better I hope.
Colin I definitely used linearfit on this one, but I think we are dealing with very strong Ha here. Sheesh, these were only 2 min subs and even the Luminance picked up a heap.
I very much miss the SHO-AIP script, wish that came back.
https://www.astrobin.com/349261/B/