Positionally averaged spectra for the observed molecular and atomic emission. The spectra are averaged across the same observed region defined by the footprint of the APEX maps (cf. Fig. 2). The red vertical line indicates the peak position of the ¹³CO(2–1) and C¹⁸O(2–1) emission at -3.3 kms^-1. The solid black vertical line gives the position of the extended emission at 6 km s^-1, observed in emission and absorption, in ¹²CO(2–1) and HI, respectively. The dashed black vertical lines indicate the extent of the cloud emission identified in the ¹²CO(2–1) V1 velocity range (see Sect. 3.2).