The soul nebula - SHO with StarTools

[RICH-DSO]

https://www.astrobin.com/gq7t1o/B/?nc=user

To create this file I used the Compose module:
S-II in Red channel
H-a in green channel
O-III in blue channel

The mix of colors is:
60% S-II + 40 H-a
30% S-II + 30% H-a + 40% O-III
100% O-III

The Compose module is easy and