Channel maps of post-imaging continuum-subtracted SiO ν= 0J = 5−4 from LSR velocity 35.7 km s-1 to 58.7 km s-1, with a channel width of 1.0 km s-1. The systemic velocity is 46.7 km s-1. The horizontal and vertical axes indicate the relative offsets (arcsec) in the directions of right ascension (X) and declination (Y), respectively, with respect to the fitted absolute position of Mira A. The white contours represent 6, 12, 18, 24, 48, and 72σ and yellow contours represent −60, −36, and −6σ, where σ = 0.80 mJy beam-1 is the map rms noise. The circular restoring beam of FWHM for the SiO image is indicated in white in the bottom left corner of each panel. In the first panel of the top row, orange contours at 0.1, 0.3, 0.5, 0.7, and 0.9 times the peak flux density (73.4 mJy beam-1) of the 229 GHz continuum emission are also drawn and the corresponding restoring beam of FWHM is indicated in orange in the bottom right corner. The white box centred at Mira A indicates the region of the zoomed maps of SiO ν= 0 (Fig. 3), ν= 2 (Fig. 5), and H2O v2 = 1 (Fig. 6). In the second and third panels of the top row, the sizes of the uniform disk and Gaussian models, respectively, in our continuum analysis are drawn in blue.
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