Apparent velocity in unit of c (black open circle), and Doppler factor (black open diamond), as a function of θ_obs, computed with our conical jet model (velocity profile D₁) assuming θ_j = 0°.001 and γ₀ = 10. We also display the theoretical curves for the apparent velocity (red line) and Doppler factor (red dotted line) of a point source of the same Lorentz factor γ₀ = 10. The agreement is excellent.