Fig. 2.

(a) Models for the diffuse reflectance compared to the total simulated reflectance for ${\mu }_a=0.01{\mathrm{mm}}^{-1}$ and ${\mu }_s^{\prime }=1{\mathrm{mm}}^{-1}$ for the HG phase function with ${\mathrm{g}}_1=0.9$ and (b) the two-term HG phase function with ${\mathrm{g}}_1=0.83$. In both, the diffuse (higher values of ${\mu }_{\mathrm{s}}^{\prime }{f}^{-1}$) and the subdiffuse regime (lower values of ${\mu }_{\mathrm{s}}^{\prime }{f}^{-1}$) the diffuse reflectance should be equal to or lower than the total reflectance. This is only true for $R_{\mathrm{PCBC}}$ in this figure. Thus, $R_{\text{Cuccia}}$ and $R_{\mathrm{EBC}}$ overestimate the diffuse reflectance.