Fig. 1.

Concept of judging the suitability of the parameter $R_{p(\theta b,\theta f)}$ for a specific forward and backward integration angle. For a certain reflectance value ($R_0$), the dispersion of $R_{p(\theta b,\theta f)}$ for that reflectance (light blue) is divided by the entire range of $R_{p(\theta b,\theta f)}$ (green). This relative dispersion was determined for five reflectance values (depicted in red) for ${\mu }_s^{\prime }d=0.1$, per set of 207 simulations with the same NA.