APEX [C I] 492 GHz and ¹³CO(2−1) spectra (top and bottom for each panel). The fitted Gaussians are overlaid in red, and the source velocities are indicated as the gray dashed lines. Several spectra (in particular ¹³CO(2−1)) show absorption features, which most likely result from contaminated reference positions. On the other hand, [C I]-absorbing components toward G43.17+0.01 and G330.95−0.18 are labelled with the word “ABS”.