are the half-opening angle of the torus $\theta_{\mathrm{OA}}$, the line of sight inclination angle $\theta_{\,\mathrm{i}}$, the torus equatorial column density $N_{\rm\,H}^{\rm\,T}$ and the photon index $\Gamma$ of the primary continuum. [*Note that $N_{\rm\,H}^{\rm\,T}$ should not be confused with the observed hydrogen column density $N_{\rm\,H}$. In all objects, $N_{\rm\,H}\leq N_{\rm\,H}^{\rm\,T}$, with $N_{\rm\,H}=N_{\rm\,H}^{\rm\,T}$ only if $\theta_{\,\mathrm{i}}=90^{\circ}$*]{}. In Fig.\[fig:tor\_CFL1\] a schematic representation of the geometry considered is shown. The dependence of $N_{\rm\,H}$ on the inclination angle is given by Eq.3 of @Ikeda:2009nx. In the model of @Ikeda:2009nx the ratio $R_{\mathrm{in}}/R$ is fixed to 0.01, and the inclination angle of the observer ${\mathit \theta}_{\mathrm{i}}$ can vary between $1^{\circ}$ and $89^{\circ}$, $N_{\rm\,H}^{\rm\,T}$ between $10^{22}$ and $10^{25}\rm\,cm^{-2}$, while $\theta_{\mathrm{OA}}$ spans the range between $10^{\circ}$ and $70^{\circ}$. Because of the assumed dependence of the half-opening angle on the luminosity, the interval of values of $\theta_{\mathrm{OA}}$ allowed by the model limits the range of luminosities we can probe. In the following we will consider luminosities above $\log L_{\mathrm{X}} = 42$, as below this value few AGN are detected, and several works point towards a possible disappearance of the molecular torus (e.g., [@Elitzur:2006fk]). The upper-limit luminosity we can reach depends on the $\theta_{\mathrm{OA}}-L_{\mathrm{X}}$ relationship used, and considering $\theta_{\mathrm{OA}}^{\mathrm{\,max}}=70^{\circ}$, is 