When you look at Helix in just Oiii its interesting how different the photons are splattered about in a sunburst pattern when compared to how the Ha appears. This is then a view of the construction of NGC7293 in bicolour but processed with a focus on keeping Oiii visible. Noisy as buggery, really not enough Oiii data but enough to get the drift I hope.
biColour
NGC7293 - Helix Nebula in Bicolour
Construction
Constructing the Helix
Thanks for looking