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Fig. 1

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Top: from left to right: a monolithic giant aperture (the so-called meta-telescope), a diluted array of four telescopes in Fizeau mode and in the two hypertelescope modes FSD and FAD. Bottom: phase of the image transform for the test object, which clearly illustrates it visible the aliasing effect in the FAD mode. This aliasing makes it impossible to recover the Fizeau spectrum in the FAD mode, while the inverse operation remains possible in the FSD mode.

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