Sketch of the geometrical arrangement assumed in the model (not to scale). We consider a spherical BLR with radius R_BLR and a dusty torus at R_IR. In all cases, we consider the emission from a small compact “blob” of radius R_b moving with Lorentz factor Γ_b. While in case A we assume that the blob is responsible for the entire SED, in cases B and C, we also consider the emission from a “standard” spherical emission of radius R equal to the cross-sectional size of a conical jet with semi-aperture angle φ, moving with bulk Lorentz factor Γ located outside (B) or inside (C) the BLR. Each region is characterized by different values of the physical parameters, such as the magnetic field, electron density, and energies. See text for more details.