Core position as a function of the inclination angle for 5 GHz and 7 GHz with parallel magnetic field configuration and κ₀ = 0.6. The dashed lines represent an exponential decay in the positions as the angle increases, given by l ∝ e^q/η. The dotted line represents the jet base. The optical depth becomes τ < 1 all along the conical part of the jet for angles greater than 9.1° (blue circle) and 7.6° (red circle) for 5 GHz and 7 GHz, respectively. This last inclination angle where the core is present in the conical jet is plotted for all frequencies and different κ₀ in Fig. 6.