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Optical parameters of the pseudo-blood phantom: red line and blue line are the molar extinction coefficients of NiSO4 and CuSO4; green line with hollow dots, yellow dashed line with crosses and black dotted line with boxes are the absorption coefficient of 75 %, 50 % and 25 % pseudo-SO2 blood phantom, respectively. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article).
