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Fig. 3

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PSF test cube chosen for evaluation. The text in each panel reports: time step, elevation in degrees, azimuth in degrees. Each PSF is normalized to 1 (black). The gray color scale was reversed for clarity. The apparent rotation of the PSF with time is the result of the projection of the interferometer aperture toward the source direction, which depends on the interferometer location, declination of the source, and observing time (see Fig. A.1 for an illustration).

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