PACS data towards W3-IRS5. For all maps, 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. Middle: comparison of the integrated absorption measured in the HIFI map relative to the absorption at the map center, with the continuum flux measured in the PACS map relative to the map center. The dashed red line shows the linear regression line and the dotted black line a 1:1 relationship. Bottom: map of the line to continuum emission/absorption in the 25 PACS spaxels. The vertical scale runs from 0.85 to 2.5. The data have not been corrected for the contamination in the OFF position.