Position velocity (PV) cuts of SiO υ = 1, J = 6–5 along the direction of the equator (PA = 115°) through different δy offsets (δy = −0″.02, 0″, and +0″.02 shown in the top panels) and the nebula axis (PA = 25°) through the nebula center (δx = 0″ − bottom) as in Fig. 4; NaCl line-stacked PV diagrams along the equator are overplotted (white contours) in the top panels. In the bottom panel, we overplot the SiS υ = 0, J = 12–11 axial PV-diagram instead to help visualizing the locus of the SiO υ = 1, J = 6–5 emission at the base of the SS-outflow arising from the lobes’ interior as well as the comparable expansive kinematics of these two transitions.