Fig. A.1.

Spectra of the 12CO(2-1), 12CO(3-2) and 12CO(4-3) emission observed with APEX (left), and the 12CO(1-0) emission from ALMA convolved at APEX resolutions for lines shown in the left panel (right). For the APEX data, the spatial resolution is about 3.2 km s−1 for the CO(2-1) emission and 6.4 km s−1 for the CO(3-2) and CO(4-3) spectra. The resolution of the ALMA+ACA CO(1-0) spectra is about 4.4 km s−1.
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