Fig. 3
Closure phases of Mira measured with IOTA/IONIC. The closure phases are plotted against the maximum spatial frequency of each triangle. The closure phases are compatible with 0(π) up to the first zero crossing of the squared visibilities near 50 cycles arcsec−1. Beyond that spatial frequency, closure phases depart from 0(π) meaning thesource is not centro-symmetric at scales smaller than the typical radius of the star.
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