Fig. A.1.
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Imagette from CHEOPS. It shows the star being occulted by Triton in the center and the bright PSF of Neptune in the lower right corner. The peculiar shape of the PSF is due to the defocused optics of CHEOPS. The diameter of the imagette is 60 arcsecs, and the separation between Neptune and Triton varied between 18 and 15 arcsecs during the observation.
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