Fig. 1

Continuum image of the Mira AB binary at Band 6 (left). Residuals in Band 6 at the location of Mira A after subtracting the best fit disc model (middle) and the disc model including a compact Gaussian hotspot (right) from the visibilities. The dashed ellipse indicates the size of the fitted stellar disc. Contours in all three plots are drawn at 3,30,90,270,810σ with σ = 140 μJy beam-1. The beam size is shown in black in the bottom left corner of all three figures.
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