Components V_axi vs. V_Φ (see definitions in Sect. 4.3) for the 3D maser velocities shown in Fig. 12. Colored error bars are used to indicate values and associated errors; the colors represent the distance from YSO-1 projected along the jet axis, R_axi, as coded in the wedge on the right-hand side of the panel. The black dashed line shows the linear fit to the subset of points within the region delimited by the horizontal and vertical black dotted lines, corresponding to V_Φ ≤ 20 km s⁻¹ and V_axi ≥ 5 km s⁻¹.