Reduced χ2 maps for HD 190658: shown is the reduced χ2 (logarithmic scale) as a function of the angular diameter (x-axis) and the relative flux level of the background (y-axis) based on our PIONIER data. These maps were computed using LITpro assuming a uniform disc plus background model. It is clear that the minimal reduced χ2 corresponds to the model without any added background.
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