Kinematics of CO 2–1 emission and HI absorption. The first and second moments of the deconvolved data-cubes are shown, together with position-velocity diagrams along the major (45°) and minor (135°) axis of the molecular emission. The color scale starts at a signal-to-noise ratio of 5. In the first- and second-moment maps, the contour spacing is shown as Δv, in km s^-1. Notice the velocity shift in the PV diagrams of CO 2–1 and HI. For discussion, see Sects. 3.2, and 4.1.1.