PV diagram along the major axis (PA ~ 135 degrees) for different tracers including NaD (the black and green circles indicate the main and the secondary components, respectively, see Sect. 3.1.1), narrow Hα (red triangles), and CO(2−0) (blue squares) data. Error bars are not displayed for the ionized gas, stars, and the NaD secondary component speeds since they are, typically, less than 15 km s^-1, therefore smaller than the corresponding symbols. We note that we did not include the PV curve for the Hα-broad component since it is not observed along the major kinematic axis and it is likely tracing non-circular motions (Sect. 4.4).