Panel a: CO(3–2) emission in the velocity range from 30 to 46 km s-1. Contour levels go from 0.3 K km s-1 (~20 rms) to 3.3 K km s-1 in steps of 0.5 K km s-1 and from 4 K km s-1 in steps of 1 K km s-1. White numbers indicate the identified molecular clumps (see text). Panels b: to i) channel maps of CO(3–2) in intervals of 2 km s-1(blue contours) superimposed on the 8.28 μm MSX-A emission (red color scale) and 870 μm ATLASGAL emission (green color scale). Contours go from 0.2 K km s-1 (~8 rms) to 9.2 K km s-1 in steps of 1 K km s-1, and from 11 K km s-1 in steps of 2 K km s-1. Infrared sources identified in the 870 μm emission (see Sect. 4) are indicated in panel b in green. A zoom of the central region with the emission of the HCO+(4–3) line (black contours) in the velocity interval from 36.5 km s-1 to 42.4 km s-1 is shown in the lower right corner of panel i. HCO+ contour levels are 0.07 (~8 rms), 0.12, 0.21, 0.35, 0.6, 0.8, and 1.0 K km s-1.
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