Figure 3.

(Color online) Reflectance as a function of x at y = 0 for illumination with incident angle θ_i = 45° and beam radii ρ = l*/2 (a, b) and ρ = l*/10 (c, d). Comparison is provided for SHEF₈, SHEF₉ with Monte Carlo (MC) for strongly-scattering (${\mu }_s^{\prime }/{\mu }_a=100$) (a, c) and weakly-scattering (${\mu }_s^{\prime }/{\mu }_a=1$) (b, d) media. Also shown is the SOS extension SHEF_8,9 for all cases. The insets show the relative errors of SHEF_N with respect to Monte Carlo.