Left panel: moment zero image of the SiO emission integrated over the V_LSR between 21.4and 24.0 km s⁻¹. The grey contours highlight the elongated emission and are at the 10, 15 and 20 σ levels (σ = 5.524 mJy beam⁻¹ km s⁻¹). The blue and red solid contours show blue- and red-shifted high velocity SiO emission thought to be tracing the high velocity component, possibly an underlying rotating disc (levels at 10, 15 and 20 σ, where σ = 9.57 and 9.41 mJy beam⁻¹ km s⁻¹ for the blue- and red-shifted high velocity emission) while the dashed lines indicate the 10 σ level (σ = 7.54 and 6.58 mJy beam⁻¹ km s⁻¹ for the blue- and red-shifted emission) attributed to the lower velocity component. The velocity ranges are indicated to the top of the figure, a scale bar to the bottom right, and the synthesised beam to the bottom left. The black solid line is the direction of the outflow at a PA of 135° and the dotted is that of the disc major axis at a PA of 30°, corresponding to the cut used for the PV analysis (see Fig. 4). Right panel: plot of the centroid positions from a 2D Gaussian fitting of each channel from the SiO image cube between −0.3 and 45.6 km s⁻¹, clearly showing that the blue- and red-shifted emission are predominantly to the north-east and south-west, respectively. We note that the scale is changed (by a factor of ten) compared to the left panel. A scale bar is also indicated to the bottom right.