Overlay of the maps of high-velocity CO emission (solid blue and red contours), and non-systemic SiO emission (dash-dotted cyan and magenta contours). The three separate CO velocity bins on either side of the systemic velocity shown in Fig. 4 are collapsed into one bin for this figure (solid blue and red contours). The blueshifted and redshifted SiO emission (dashed cyan and magenta contours) is the same as shown in the bottom left panel of Fig. 3. A linear scale indicator and the size of the synthesized PILS beam are plotted in the bottom right and bottom left corners, respectively.