The color coding is the same as for NGC 7662. Inisde the main body of the nebula the gas has large red and blue shifts, especially near the top and the bottom. The long and slightly curved football-shaped outline of the bubble is seen best in the Halpha image. It and the gas outside of it are quiescent. A physical model for the system has not yet occurred to us.
Suggestions are welcome.
Pure blue regions are twice ionized gas generally the edge of the inner, bright core of the parent nebula. The red structure consists of neutral gas, and the green structure is once ionized. The importnace of this is that the gas is sufficiently dense to stop the ionizing agent, presumably stellar photons. We don't yet have good answers. This could be the result of a shock or an ionization front.