Overlay of the integrated emission of the ¹³CO(2–1) line within selected velocity intervals (indicated in the upper part of each panel) in contours and the LABOCA image at 870 μm in grayscale. Panel a) contour lines are from 0.5 to 3.5 K km s^-1 in steps of 0.5 K km s^-1. Panel b) contours are from 1.5 to 12.0 K km s^-1 in steps of 1.5 K km s^-1, and 14.0 K km s^-1. Panel c) contours are from 0.5 to 3.5 K km s^-1 in steps of 0.5 K km s^-1. Panel d) overlay of the ¹³CO contours of panel b) and the IRAC 8 μm emission (in grayscale). Panel e) ¹³CO spectrum towards the brightest region of the southern clump.