Modeling a central, isotropic source that irradiates a dusty, equatorial scattering torus with a half-opening angle of 30° (see text). The spectrum represents the polarized flux, PF/F_∗, normalized to the source flux F_∗, for a viewing angle of i = 72°. The spectra were calculated by sampling the same number of photons but using two different random number generators. Black dashed line: the LCG algorithm as implemented in stokes 1.0; red solid line: the MTG algorithm as implemented in stokes 1.2.