IRDC18223: the color scale shows in the left, middle and right panel the emission from atomic carbon [CI] in the three velocity regimes marked at the bottom of each panel. are [42; 49]. [43; 49] and [43; 55] km s^-1. The cyan contours in the left panel correspond to [46.9; 48.0] km s^-1. The black contours always show the 1.2 mm continuum emission (Beuther et al. 2002) starting at 3σ level of 36 mJy beam^-1 and continuing in 3σ steps.