PIONIER closure phases for HD 352 (in degrees) as a function of the spatial frequency in 1/rad (×107). The data points are shown in red with error bars, while the model of an elongated disc with an additional punctual source that provides the best fit is indicated with blue solid dots. Given the error bars, the significance of these data, compared to zero closure phases, is very low, as all but three points do not deviate from zero more than the error bar.
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