Integrated intensity image of the [C ii] line at 158 μm in color. Contours correspond to the tracers mentioned in the individual panels. The peak intensities (and contour levels as % of peak) are 8 μm continuum image: 5306 MJy sr^-1 (2% to 10% (2.5% step), 10 to 50% (5% step), 50 to 100% (20% step)), PACS 70 μm 1.32 10⁴ MJy/sr (10%, 20%, 30%, 45%, 50% to 100% (10% step)), C91α: 7.3 × 10^-3 Jy/beam (5%, 20%, 30%, 45%, 50% to 100% in steps of 10%), H₂ S(1): 7.3 × 10^-20 W cm^-2/beam (10% to 90% in steps of 10%). The C91α image is from Wyrowski et al. (2000) and the H₂ S(1) image is from Gatley et al. (1987). The offsets in all figures are measured in arcseconds relative to HD 37903, which is marked by a star symbol.