CO(2−1) emission at 9 pc resolution (black contours) in the SW-Bar superimposed to the Spitzer 8 µm map (upper-left), MCELS Hα map (upper-right), Herschel 160 µm map (bottom-left), and AzSTEC 1.1 mm map (bottom-right). The CO contours correspond to 1.5,4.5, and 10.0 K kms⁻¹. An evolutionary classification of YSOs from Sewiło et al. (2013) and Simon et al. (2007) are indicated by red (Stage I), green (Stage II), and blue (Stage III) circles in the upper-left panel. The sizes of these circles are proportional to the stellar luminosity. In the upper-right panel, the ″×″ symbols show the location of the HII regions identified by Pellegrini et al. (2012). In the bottom-right panel, the white contours indicate the 1.1 mm emission at 5σ.