Fig. 2

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Continuum emission detected towards WB89-670 with ALMA. The light blue contours in the left and right panels correspond to the 3 mm and 2 mm continuum emission, respectively. Contours start from the 3σ rms level (~8 × 10−5 Jy at 3 mm and ~3 × 10−4 Jy at 2 mm), and are in steps of ~5 × 10−5 Jy and ~2 × 10−4 Jy, respectively. The synthesised beam is depicted in the bottom left corner, and the white circle indicates the ALMA primary beam at the two wavelengths. The region shown in the 2 mm images corresponds to the dashed square illustrated in the top left panel. The heat-colour image in background is the Ks band of 2MASS (Fig. 1) in the top panels and the WISE 22µm band in the bottom panels.
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