Images of 6 randomly selected SDCs. The colour scale is the Spitzer 8 μm emission. The black contour is the τ_{8 μm} = 0.35 contour marking the boundary of the SDC as originally identified in PF09. The white contours are the Herschel H₂ column density contours, all starting at 0.1 × 10²² cm^-2, and separated by 0.5 × 10²² cm^-2. The axes of the images are galactic coordinates in degrees. In the top right corner we give the name of the SDC and if our identification scheme has recognised them as being identified with a Herschel column density peak. SDC11.807-0.283 is not identified while, by eye, it seems clearly associated with a faint peak. Criterion c₂ for this cloud is slightly below our threshold value of 3, explaining why it is not picked up by our identification scheme.