Kinematics of the masers in comparison between the observations and the simulated streamlines. In all panels, red crosses and blue circles refer to the simulated streamlines emerging from the launch radii of 4 and 6 au, respectively, while the black dashed and dotted lines report measurements and corresponding errors for the four labeled maser streams (Moscadelli et al. 2022, see Table 1). For each maser stream, the measurements are reported over a range of distances along the jet axis matching the extension of the stream in the observations (Moscadelli et al. 2022, see Figs. 3 and 4). Panel a: Plot of the rotation angle versus the offset along the jet axis, which is taken positive also for the SW stream. A set of simulated streamlines launched at different azimuthal angles is shown. Panel b: Plot of the rotation radius versus the offset along the jet axis. We note that the rotation radius for the SW streamline is taken to be negative. Panels c, d, e, and f: Plots of the angular velocity versus the offset along the jet axis, comparing the simulations with the SW, NE-1, NE-2, and NE-3 streams, respectively.