PACS data towards W49N. For all maps, the offsets are given relative to the central position listed in Table 1. The data have been corrected from the weak emission in the OFF position. Left: continuum emission at 158 μm. Contour levels are drawn at 0.2, 0.3, 0.4 ... 0.9 relative to the maximum. Middle: [C ii] emission in the 25 PACS spaxels. The continuum emission has been subtracted. The vertical scale runs from −150 to 300 Jy. Right: map of the line to continuum ratio in the 25 PACS spaxels. The vertical scale runs from 0.85 to 3.0. Please note the very low contrast in the central spaxels.