Fig. 4.
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VLTI/PIONIER squared visibilities observed on 12 December 2020 as a function of the spatial frequency. The observed data are displayed in black with corresponding error bars. The best-fitting model of the deformed star is shown in red (χ2 = 0.83), and the best-fitting limb-darkened disk model is shown in blue (χ2 = 1.75). The same limb-darkening law is applied in both cases.
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