Constraints on the radial velocity component V_R. Left panels: Transverse PV diagrams averaged over a slice of width ∆Z = 0.2″ at selected positions δz along the flow. In red are shown the ellipse fits. We show side by side the PV diagram with and without the fit for more visibility. Right panel: V_Z tomography of the outflow in the outflow referential, extrapolated beyond Z > 1200 au. The red arrows represent the velocity directions determined from the ellipse fits. The arrow colors trace the V_Z values determined from the ellipse fit. R and Z units are in au.