Continuum-subtracted channel maps of the SiO emission. The labelled velocities have been corrected for v_*. The central observed frequency is the average over the observation epochs. The contours are drawn at 3, 6, 12, 24, 48, and 96 times the rms noise value outside the line (σ_rms = 1.5 × 10⁻³ Jy beam⁻¹). Length scales are indicated in the bottom left panel. The maps are centred on the continuum peak position, which is indicated by the yellow star symbol. The beam size is illustrated in the bottom-right corner of the bottom-left panel (0.085″ × 0.079″).