Probability density function R_cusp at 4.4 μm (rest-frame) for f_AD = 0.2 (left), f_AD = 0.1 (middle), f_AD = 0.02 (right). The distributions are given for three different luminosities log (L_bol/erg/s) = 44.2, 45, 46. The upper panel shows the distribution for a compact torus and the bottom panel for an extended torus. The value of R_cusp in absence of microlensing is R_cusp = 0.068 and is depicted with a vertical dashed line.