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Swan nebula (M17) old work reprocessed. Red SII Green H-alpha Blue OIII 2hrs each in 1hr subs. STL11000M on 20" PlaneWave CDK.. Notice the very prominent (and slightly threatening) arch of webbed strands of SII (red) running from about 8 o'clock right round to 1 o'clock, indicating thin, cold, much-processed material from deep inside now-dead stars.
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