Fig. A.1
Examples of the transfer functions and raw science data at a wavelength of λ = 2.2 μm. In the visibility plots, open symbols mark calibrator observations and filled symbols mark the observations of HD 85567. In the closure phase plots, the observations of HD 85567 are marked by star symbols and calibrator data by filled circles. A frame selection of 10 percent was used, but the behaviour is independent of the frame selection used.
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