Position-velocity diagram, with positions varying along PA = 48° (top) and PA = 138° (bottom) for the stellar component, [N II] gas, and Na ID gas, as labelled in the figure. Distances on the x-axis are measured from the intermediate position between the two nuclei, from the bottom to the top of the FOV. Stellar and gas velocity measurements are obtained by averaging 3 × 3 pixels along a given PA from the maps shown in Figs. 3, 10–12; CO(2–1) velocities are obtained from Fig. 5 in Scoville et al. (1997).