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Fig. 4


Image of Betelgeuse in the continuum for the spectral window spw2 associated with the 28SiO(ν= 2, J = 8−7) and 29SiO(ν= 0, J = 8−7) emission lines. The white circle represents the equivalent uniform disk size of the star (Rstar = 29.5 mas), and the red cross marks the centroid of the intensity distribution taken as the center of the stellar disk. The gray disk at the bottom left of the plot is the ALMA beam size, and the contour levels are labeled in mJy beam-1.

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