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Thanks for that, Paddy.
The section of the Coalsack near the Jewel Box, in particular, is noticeably dense with dust in these maps, and this is also very obvious visually;
On poorish nights, one notices that the starfield all of a sudden "stops" at the interface between the starfield and the dark nebula. On excellent nights, I have seen this high-extinction part of the Coalsack looking almost as if some ink had been spilled over the starfield.
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