Same as Fig. 3 but showing the impact of a circumnuclear obscuring torus with different aperture angles expressed in units of beaming angle Θ_b = 1/Γ (the uppermost line represents the case of no absorption). The upper scale of the figure shows the representative values of radio loudness (R) corresponding to the flux density limit in the X-axis and using a magnitude of 21 and assuming an average redshift of 4.5. The depth (5 × rms) of some ongoing and/or planned surveys is also indicated. The points are as in the previous figure. The horizontal dashed line indicates the expected total number of jetted QSOs in 10 000 sq. degrees if they represent 10% of the total QSO population.