SED fitting of LBQS0109 (left) and HB8903 (right). The blue points show the QSO emission fluxes from SDSS, 2MASS, and WISE photometry. The total best-fit models are plotted in red, while accretion disk, old star, and torus components are plotted in blue, purple, and orange, respectively. The filled areas denote the uncertainties estimated with a Monte Carlo procedure, see Balmaverde et al. (2016) for more details.