Top: velocity-integrated intensity maps of ¹²CO J = 1 → 0 (gray), [C II] 158 μm (red contour), and ¹²CO J = 2 → 1 (green contour). The contour lines (from thin to thick) are 50%, 75%, and 90% of the respective peak emissions. The stars indicate the O and B ionizing stars (Beetz et al. 1976; Hanson et al. 1997). The reference position (Δα = 0, Δδ = 0), marked with a cross, is as in Fig. 2. Bottom: velocity channel maps (at 1 km s^-1 width) of the same lines as above. Contours are 20%, 40%, 60%, 80%, and 100% of the respective peak emissions. All maps have been convolved with the largest beam of 24′′ corresponding to the CO J = 1 → 0 map.