PACS data towards W33A. The offsets are given relative to the central position listed in Table 1. Top: continuum emission at 158 μm. Contour levels are 0.2, 0.3, 0.4 ... 0.9 relative to the maximum. Bottom: map of the line to continuum emission/absorption in the 25 PACS spaxels. The vertical scale runs from 0.85 to 2.5. Please note the very low contrast in the central spaxels. The data have not been corrected for the contamination in the OFF beam.