Fig. 5.
(u, v) coverage for simulated observations of Sgr A* with the EHT 2017 array at 230 GHz. The magenta disk represents the range of (u, v) constrained by the second moment regularization, with the boundary at the 1/e point of the corresponding visibility amplitude function for Sgr A* assuming an isotropic source of 60 μas FWHM (Johnson et al. 2018).
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