After overcooking my previous version, I've now got a new version with almost double the amount of data from before (around 27 hrs, less PI subframe select). I used this tutorial: https://thecoldestnights.com/2020/06...ith-pixelmath/ as the basis for doing the NB combination, but had to make modifications as the SII and OIII signals had strong overlap.
Astrobin link with all the details and a larger pic without the horrible compression: https://astrob.in/olwrnf/C/
