Spectra (top row), PD (middle row), and PA (bottom row) profiles of the direct radiation observed at infinity, computed using the KYN suite. The Stokes parameters for the emerging radiation are derived from STOKES simulations, using CLOUDY for the slab ionization structure. Results are shown for two BH spin values, a = 0 (left column) and a = 0.998 (right column), and for both the CIE (dotted lines) and the PIE (solid lines) ionization regimes. The BH mass, accretion rate, hardening factor, and stopping column density, as well as the color code, are the same as in Fig. 5. The horizontal black lines in the bottom panels indicate the PA of the emerging radiation, found to be perpendicular to the disk symmetry axis.