Fig. 6
Colour map of S345∕S250 towards RCW 36 (panel a) and IRS 31 (panel b). The map at 345 GHz (LABOCA) has been smoothed to the angular resolution of the map at 250 GHz (SIMBA) and then divided by it. The emission at 345 GHz is overlaid in contours of 1000, 3000, and 5000 Jy beam−1 (panel a) and 500, 1000, and 3000 Jy beam−1 (panel b). Only pixels with a brightness 
5 rms have been selected.
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