Fig. 1
Far-infrared colour composite image of M17 based on Herschel PACS data. Blue: 70 μm, green: 100 μm, and red: 160 μm. The sources with circumstellar disks are shown in blue, those with IR excess longwards of2.5 μm in green, and the “naked” OB stars in black. We do not observe an obvious trend in extinction properties with the location in the region.
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