Fig. 6.

Depth profile of the true and recovered 3-D maps of $c_{{\mathrm{NiSO}}_4}$ (A) and $c_{{\mathrm{CuSO}}_4}$ (B) along the dashed line indicated in the inset of (A). Inset of (A) x–z-slice of the true $c_{{\mathrm{CuSO}}_4}$ distribution (see Fig. 5D). (C) cross-sectional x–y-image of the initial pressure distribution at depth of z = 4.2 mm (λ = 726 nm). The initial pressure along the dashed line is shown in (D), which also shows the chromophore concentrations recovered from original and corrected image data sets. The solid, dotted and dashed lines indicate the true values, those recovered from original images, and those recovered from corrected images, respectively. $c_{{\mathrm{NiSO}}_4}$ is shown in green and $c_{{\mathrm{CuSO}}_4}$ in blue. The red solid line illustrates the initial pressure distribution (original image data set).