Top left panel: continuum emission at 21 cm in Kelvin. Top right and middle panels: H i column density for optically thin assumption and optical depth corrections, respectively. The continuum and H i emission data are based on VGPS, whereas the optical depth correction used in the middle panel is based on the THOR data. The bottom panel shows the H2 column density from the HiGAL data (Nguyen-Lu’o’ng et al. 2013). In all panels, the black and white/blue contours present the continuum emission at 21 cm (black contours show levels of 10, 30, and 70 K; white/blue contours show levels of 200, 400, 600, and 800 K). The black ellipses in the middle and lower panels have an equivalent radius of r = 80 and 140 pc. Several important objects are marked.
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