Dust temperature map of CB 17 (color scale), overlaid with contours of the hydrogen column density (white: 10²¹ – masked by the yellow N_out contour – and 10²² cm^-2, black: 2, 4, 6, 8, and 20 × 10²¹ cm^-2). Yellow contours mark N_out (Eq. (3)) and N_1′ (Eq. (10)). The yellow square marks the column density peak and position of CB 17-SMM. The asterisk marks the position of CB 17-IRS (Table 5; see also Launhardt et al. 2010).