STOKES simulations of a circular torus with various half-opening angles, Θ, seen at several observer inclinations, i. The color-coded polarization degree is integrated from 3.5 to 6.0 keV to avoid any contribution from intense emission lines. A positive polarization degree indicates that the photon electric field vector is parallel to the axis of symmetry of the system. Thus, negative polarization stands for perpendicularly polarized photons. Each colored dot represents a (Θ, i) simulation. If the polarization degree and angle of a dot is consistent with the X-ray polarization of the torus measured by IXPE, the dot is shown in black.