Maps of the dust ridge presented similar to Fig. 5 in Immer et al. (2012a). Top: ATLASGAL 870 μm dust emission towards the dust ridge with GLOSTAR 5.8 GHz radio continuum contours overlaid with contour levels of 2%, 8%, and 13% of the maximum. Bottom: GLOSTAR VLA cutouts of sources A-E cut to a larger angular size compared to Immer et al. (2012a). For sources A, D, and E, the contours are from 10σ to 50σ in steps of 10σ. For sources B and C, the contour levels are 4σ, 12σ, and 20σ. Red crosses denote the positions of YSOs.