Left panel: inferred 70 μm intensity map extrapolated from the column density and temperature maps obtained for λ ≥ 160 μm. The green circle shows the bubble found by Ridge et al. (2006b) (CPS5 in the list by Arce et al. 2011). Right panel: difference between the observed 70 μm map and the extrapolated map. Green contours are 20 and 200 MJy sr⁻¹; blue contours show the region where T_PACSonly ≥ 20 K (see text). Colour bars are in MJy sr⁻¹.