Geoff, Mike, Michael,
Thanks for looking - and your comments.
Geoff, this is as you say, tricky to process. I really need much more time to improve the delineation of the molecular cloud. Using a synthetic L helped a bit, but I think more time would help a lot more!
Michael, you are right: the Melbourne sky where I live is nearly 2 magnitudes/square arcsec brighter than the cloud.
Mark
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