Panel a: visibilities observed at continuum wavelengths are plotted with the black dots. The dashed blue line represents the power-law-type, limb-darkened disc fit. The solid red line shows the best-fit with a power-law-type, limb-darkened disc with an extended, resolved-out component. Panel b: uniform-disc diameter across the observed wavelength range (solid red line). The observed, scaled spectrum is shown with the thin black line.
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