Fig. 5.

Isolevel distances, L, from the laser line. (b) Piecewise linear regression between the coagulation depth modelled with the wedge thickness, h, and static isolevels squared, L². When estimating h, The 30% isolevel is used as long as ${\text{L}}_{30\mathrm{\%}}^2$ ≥ 3 mm², then 20% isolevel as long as ${\text{L}}_{20\mathrm{\%}}^2$ ≥ 0.8 mm², and finally the 15% when ${\text{L}}_{20\mathrm{\%}}^2$ < 0.8 mm². The curves end when the wedge is so thick that the static scattering estimate never becomes as low as the corresponding isolevel at any distance. (c) Least squares fit between h and the static scattering S at the center of the laser line using a logarithmic function $\hat{\mathrm{h}}=-\text{a}\ln (\text{b}-{\text{K}}_{\text{s}})+\text{c}=-1.04\ln (0.87-{\text{K}}_{\text{s}})+0.96$ .