Influence of the black hole spin, a_⋆, on the spectral and structural properties of our M 87 simulations. The left column corresponds to a MAD model, and the right column shows a SANE model. Top panels: broad-band spectrum averaged for 2000 M for thermal and five different spin values a_star = −0.9375, −0.5, 0, 0.5, and 0.9375 (colour-coded) while keeping R_low = 1, R_high = 160 σ_cut = 3.0, and ε = 0.5 fixed. The middle image shows the ray-traced 86 GHz images for different spin values. Bottom panels: jet diameter and opening angles profiles using the same colour-coding as for the spectrum.