Fig. A.2
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Fitting of the differential phase data.
Top: Differential phase data from the UT4-UT1 baseline of the RU Lup observation in 2021. Here the coloured squares indicate again the pure line differential phases, excluding the influence of the continuum via Eq. A.5.
Bottom: From the pure line differential phases we obtained the photocentre shifts as projected onto the six baselines. We deprojected the overall shift vector by fitting a cosine function to the projected shift magnitudes at the respective baseline angles.
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