Influence of the R_high parameter on the spectral and structural properties of our M 87 simulations for a black hole with spin a_⋆ = 0.9375. 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 R_high = 10 (dotted), R_high = 80 (dashed), and R_high = 160 (solid) while keeping R_low = 1 fixed. The different eDFs are marked by different colours: thermal (blue), kappa with ε = 0 (green), and kappa with ε = 1 (red). The middle image shows the ray-traced 86 GHz images for three different eDFs (columns) and different R_high (rows). Bottom panels: jet diameter and opening angles profiles using the same colour and line styles as for the spectrum.