Contour levels of the CO(2−1) line intensity superimposed on the PSF-deconvolved, halo-subtracted 100 μm map of PACS (Fig. 2 of Decin et al. 2011). (Left: CO in the velocity interval (V − V_∗) = ± 2 km s^-1; right CO integrated over all velocities). Light blue contours levels: 1 to 6 K by steps of 1 K, yellow contours: 10 to 70 K km s^-1 by 1 K km s^-1. The dark blue contour levels represent 0.9 times the adjacent light blue contour levels and the green contours 0.85 times the adjacent yellow contours.