Top row: Spectra for a distant observer at D = 1 kpc and ρ_in = 10⁹ cm. We show the logarithm of EF_E/ξ₀ in cm⁻³ to compensate for the slope given by the power-law index Γ = 2 and to level the amplitude, given to a large extent by the ionization parameter ξ₀. In the color code we show the reflected-only spectra for ξ₀ = 10 erg ⋅ cm ⋅ s⁻¹ (blue), ξ₀ = 500 erg ⋅ cm ⋅ s⁻¹ (green), ξ₀ = 10 000 erg ⋅ cm ⋅ s⁻¹ (red), and for the Chandrasekhar’s formulae for diffuse reflection with 100% albedo (magenta). The primary radiation is shown in gray. The observer is inclined at i = 51° and the half-opening angles are Θ = 40° (solid lines) and Θ = 70° (dashed lines). We show the reflection from a cone (left), torus (center), and bowl (right), all for ρ = ρ_c, B = 1, and unpolarized isotropic irradiation with β = 2. Specifically for the cone geometry and Θ = 40°, we show in black solid line the corresponding spectra in the same configuration, but integrating the fully neutral reflection tables obtained with the STOKES code. Middle and bottom row: Corresponding reflected-only polarization degree, p, versus energy. For clarity, we show the results for different opening angles Θ = 40° (solid lines) and Θ = 70° (dashed lines) in separate rows of panels. In the color-code, we provide in addition the results for Thomson single-scattering approximation (yellow). For the cone geometry and Θ = 70° (bottom left), we show in addition the total polarization degree for ξ₀ = 10 erg ⋅ cm ⋅ s⁻¹ (blue dotted lines) and ξ₀ = 10 000 erg ⋅ cm ⋅ s⁻¹ (red dotted lines). For the torus (center) and bowl (right) geometries, we show the polarization degree difference Δp in %, which is the polarization degree p of the reflecting cone subtracted from the polarization degree p of the reflecting torus or bowl, respectively, in identical configurations. This is to display examples of the impact of changing curvature of the inner walls of the reflector on the resulting polarization.