Overlay of the map of CO (6–5) emission observed by the APEX telescope (colour background) with the H₂ 0–0 S(5) emission (white contours), observed with the Spitzer telescope. The wedge unit is K km s^-1 (antenna temperature) and refers to the CO observations. The H₂ 0–0 S(5) contours are from 50 to 210σ, in steps of 20σ ≃ 1.6 × 10^-4 erg cm^-2 s^-1 sr^-1. The green contour defines the half-maximum contour of this transition. Like in Fig. 1, the blue circle indicates the beam size of the SOFIA/GREAT observations, on the position of the centre of the circle, marked by a blue dot. The beam and pixel sizes of the CO (6–5), and H₂ 0–0 S(5) observations are also provided in yellow (big and small, respectively) circles in the lower right corner. The black contour delineates the half-maximum contour of the H₂ 0–0 S(2) transition. The field is smaller than in Fig. 1, and the (0, 0) position is that of the Spitzer observations (see Appendix B).