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Fig. 1


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 1.0 km s-1. The positions of Mira A (o Ceti; cyan cross) and Mira B (VZ Ceti; yellow cross) are indicated in the image. The horizontal and vertical axes are the relative offsets (arcsec) in the directions of right ascension (X) and declination (Y), respectively, with respect to the continuum centre of Mira A. The white box centred at the fitted position of Mira A indicates the region as shown in Fig. 7, within which we extract the SiO and H2O line spectra from an array of positions. The horizontal and vertical axes are the relative offsets (arcsec) with respect to the Mira A in right ascension and declination, respectively. The light green contours represent 4, 8, 16, and 32σ of the SiO emission from the gas near Mira A, where the map rms noise is σ = 0.80 mJy beam-1. The circular restoring beam of FWHM for the SiO image is indicated in white in the bottom left corner.

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