Image of BH M 87* at 1.3 mm wavelength obtained on April 11, 2017, by the EHT (adapted from Fig. 3 in EHT Collaboration 2019a). The grey contour levels correspond to brightness temperature values of (2, 2.5, 3, …, 5.5) × 10⁹ K. The white dashed lines indicate a photon ring of 42 μas in diameter equivalent to ≃11 M, and the position angle of large-scale jet PA = 288° (WNW). The units of the grid are the angular size of the M 87* gravitational radius θ_g ≃ 3.8 μas.