Series of simulated images for source regions limited to the radial coordinate values r ≤ r_max = 6 M and to different values of the polar coordinate (models TH1-4, from left to right) for two values of BH spin. In these cases, the local emitter is assumed to be stationary (β_r = 0 = Ω), and the spectral index is α = 0.5. The simulated images are shown with colour shading and grey contours, while the EHT image of M 87* is shown with solid white contours. The contour levels correspond to brightness temperature values of (2.5, 3.5, 4.5, 5.5) × 10⁹ K, both for the simulated images and for the EHT image. The dashed white circle indicates a photon ring of radius 21 μas ≃ 5.5θ_g (best-fit estimate by EHT). The dashed white line indicates the position angle PA_jet = 288° of the large-scale jet.