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Fig. B.1.

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Closure phase data for Circinus from March 2020 (blue), February 2021 (yellow), and May 2021 (red). Presented errors come from both the calibrator phase uncertainty and the statistical variation of the observables within a set of observing cycles. The black points are simulated values extracted from the final images, with errors estimated using the 1σ error maps (described in Sect. 3.1.1). The panels are sorted by length of the longest projected baseline in the closure triangle.

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