The emergent I, Q/I, and Q profiles at μ = 0.11 computed for the angle-averaged (dashed lines) and the angle-dependent (solid lines) PRD. Left panel shows the effect of optical thickness T when ϵ = 10^-4. Different line types are: thin lines T = 2 × 10⁴, medium thick lines T = 2 × 10⁶, and thick lines T = 2 × 10⁸. Inset in Q/I panel shows T = 2 × 10⁸ case for a larger frequency range. Right panel shows the effect of ϵ for optical thickness T = 2 × 10⁴. Different line types are: thin lines ϵ = 10^-2, medium thick lines ϵ = 10^-6, and thick lines ϵ = 0. Remaining common parameters are (a,r,Γ_E/Γ_R) = (10^-3,0,0).