Fig. B.1
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Zoom-in of a Ks band image of the central region of S255IR. The red cross represents the centre of the aperture, the black circle is the main aperture used, and the red dashed lines are the inner and outer radius of the annulus, which account for the background estimation. We used an aperture radius of 1″ (top panel) and 0″.15 (bottom panel).
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