Scattered ring observed at 86 GHz (first panel) with a gain corruption of 4%. The second panel shows the simulated screen that affects the source. The third panel depicts the recovered solution using the Algorithm 2. The white internal circle shows the diameter of the shadow of the simulated ring (50 μas), and the dashed green circle is 1.6 times the size of the shadow, as predicted by Lu et al. (2023); Kim et al. (2024) in M87*. The fourth panel shows the recovered screen. The screens are blurred to the GMVA resolution. nxcorr can be found in Table B.1.