Same as Fig. 1, but for Aquila/cold. The H2 column density map of the Aquila region is from Herschel Gould Belt Survey (HGBS) data (André et al. 2010; Könyves et al. 2015). The white contour in panel a and magenta dotted contours in panels e and f indicate the AV = 8 level derived from the Herschel column density map smoothed to 40″ resolution. In panel f, the magenta solid contour indicates the rough AV column density level above which significant H13CO+ (1–0) emission is detected, i.e., AV = 16.
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