Schematic picture (not to scale) of the nonlocal inhomogeneous jet as seen by an external observer. The jet has a truncated conical shape in a range of distances from the SMBH between z₀ = 0 and z_max. The inner radius of the jet at the jet base is R₀. Electrons are accelerated in the part of the jet between z₀ and z_end. We follow their cooling in different processes up to z_max = 10z_end. The half-opening angle of the jet is equal to ϕ. The jet is observed at an angle θ_obs that can be larger or smaller than ϕ.