Longitude-velocity (l-V) map covering part of the Crux tangency between longitudes to 305.̊9. a) HIFI [C ii] maps covered in two OTF longitude scans centered at l = 305.1° and 305.76° at b = 0.̊0 and 0.̊15, respectively. b) The corresponding ¹²CO map from the Mopra ThrUMMS survey. c) The corresponding H i map from SGPS survey. This map region is off to the right of the l-V trajectory of the Crux tangency, as shown in Fig. 1 (see text). See also the caption of Fig. 3 for details on the display.