Left column: ¹³CO(1–0) (black) and ¹³CO(2–1) (red) spectra averaged towards the full IRDC maps. The velocity ranges considered for each cloud are indicated with vertical dotted magenta lines and are reported in Table 2. Middle and left columns: integrated intensity maps of the ¹³CO(1–0) and ¹³CO(2–1) obtained over the defined velocity ranges. In both sets of panels, the beam sizes and 1 pc scale bar are indicated.