Map of SiO ν= 0J = 5−4 (with the continuum) at the channel of the systemic velocity (46.7 km s-1) with a channel width of 1 km s-1. The centre of Mira’s continuum is indicated by a black cross. Orange contours represent 10%, 30%, 50%, 70%, and 90% of the peak continuum flux (73.4 mJy beam-1). The black plus signs (+) indicate the positions at which SiO and H2O spectra are sampled and modelled in Sect. 4. The sampling positions are separated by 32 mas along each arm of this array of points. The circular restoring beam of FWHM for the SiO image is indicated in white at the bottom left and that of FWHM for the 229 GHz continuum contours is indicated in orange at the bottom right.
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