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Fig. 1

image

12CO 10 contours of line integrated (v = −10 to 20 km s-1) emission with levels 63.5 to 381 K km s-1 in steps of 63.5 K km s-1 overlaid on a Herschel dust column-density map at 36′′ resolution (that corresponds to 0.41 pc at a distance of 1.4 kpc). This map was corrected for an average foreground contamination of Av = 5. Prominent features, such as W75N or the DR21 ridge, are indicated in the plot. DR17, 22, and 23 are H II regions.

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