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(a) Dependence of optimal wavelengths for the determination of blood oxygen saturation on depth for a fixed value of SNRa = 30 dB, and known parameters of the biological tissue δμa = 0, δμs' = 0, and (b-d) for different values of relative error in the measurements of the optical parameters δμa and δμs' from 0.05 to 0.5.
