Moment zero map of the SiO molecular emission observed with ALMA. The contours show the continuum emission at 10, 20, 35, 50, 65, 80, and 95% of the peak emission. The positions of the SiO masers detected with the VLBA are indicated by two the pluses and the square. Right panel: zoom-in of the central part of the map. The white and yellow crosses mark the continuum and SiO extended emission peaks detected in the ALMA maps, respectively.