Fig. 10.

$f(z|\rho )$ as a function of z for $\rho =5,10,15,20,25,30,35,40\text{mm}$ (color code from brown to blue) for a two-layer medium ( $s_1=15\text{mm}$ , $s_2=75\text{mm}$ , $n_1=n_2=1.4$ , ${\mu }_{a1}={\mu }_{a2}=0.015\text{m}{\text{m}}^{-1}$ ). (a)-(e) variable ${\mu }_{s1}^{\mathrm{\prime }}=0.5,0.75,1.0,1.25,1.5\text{m}{\text{m}}^{-1}$ , from top to bottom) and fixed ${\mu }_{s2}^{\mathrm{\prime }}=1.0\text{m}{\text{m}}^{-1}$ ; (f)-(j) fixed ${\mu }_{s1}^{\mathrm{\prime }}=1.0\text{m}{\text{m}}^{-1}$ and variable ${\mu }_{s2}^{\mathrm{\prime }}=0.5,0.75,1.0,\text{m}{\text{m}}^{-1}$ , from top to bottom).