Similar to Figures 3 and 4 for the M87^* and Sgr A^* models, respectively. Here, we have Sgr A^* dilaton (D) and M87^* Kerr–Newman (KN) models (Section 3.8). For the former, the dilaton parameter b_* = 0.504 (see text) is labeled as b_+0.5. For the latter, the geometrized charge q_* = C is given with a q_C label. As the D and KN models were ray-traced only in total intensity, we have faded out the Stokes 𝒬, 𝒰, 𝒱 data. Visibility amplitudes have been normalized to unity. Next to the 2017 coverage, measurements are shown for possible future EHT observations, where the AMT or ngEHT would join (see text).