Position-velocity plots along the two arms of the observed HIFI cross. Left: perpendicular to the major axis of the galaxy, right: along the major axis of the galaxy. For each plot the color bitmap is the [C ii] in main beam temperature (Kelvins), the white contours are the CO(2−1) Tmb temperature every 0.1 K starting from 0.1 K, the dark blue contours are the H i temperature every 10 K starting from 10 K. The horizontal bar at the bottom of each panel indicates the 12′′ beamsize of the observations.