SiO J = 2–1 maps extracted from high spatial-resolution data cube. Left: flux density (S_ν) maps at different offset velocities with respect to the systemic velocity of the source (v_* ~ −26.5 km s⁻¹, Cernicharo et al. 2000) in LSR scale. The central velocity offset of each channel is shown at the bottom-left corner of each panel in kilometres per second. The width of each velocity channel is approximately 1 km s⁻¹. The coordinates are given as offsets from the source position in arcseconds (see Sect. 2). The size and orientation of the synthetic beam are shown at the top-left corner inside the first panel. The contours shown in black correspond to 5σ, 2, 10, 50, and 90% of the peak flux density (see Table 1). Right: moment zero map. The contours shown correspond to 10, 25, 50, 75, and 90% of the peak emission (see Table 1).