Fig. 3.

Value of the minimized objective function $u({\mu }_{\mathrm{a}})$ (first column), relative errors of the estimates $E(\%)$ (second column), and the number of photon packets $P$ (third column) as a function of iteration evaluated with the S-SGN (blue solid line) and the A-SGN (red dashed line) methods. First row: the domain was illuminated from all boundaries, second row: the domain was illuminated from top and left boundaries.