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Very fine, Greg. Lovely.
A slight increase in contrast in the blue seemed to improve it even further.
My very amateur and shaky understanding (Wheeler, Cosmic Catastrophes, Kaler, Extreme Stars, etc) is that a SNR is still self-emitting, from a variety of mechanisms, including (in some sort of overlapping time sequence) radioactive decay (months to years), braking radiation (eg Crab nebula), mechanical shock energy (immediate to thousands of years), and finally recombination of ionized hydrogen and oxygen. Only very late in the piece would the gas be glowing purely and only from energy from other OB stars. But the details elude me. I'll go away and read up on it.
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