Change in the maser velocity direction and amplitude moving along the jet axis. The left and right panels refer to the B3 stream and N region, respectively. The inclination, θ, and azimuthal, ϕ, angles of the direction of the velocity (see Fig. 2c) and the velocity component along the jet, v_ɀ, are plotted versus the position along the jet, ɀ, in the top, middle, and bottom panels, respectively. Values and corresponding errors are denoted with dots and error bars, respectively, where red marks velocities ≲6 km s⁻¹ in the B3 stream.