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(a-c) pseudo-uSO2, pseudo-cSO2 and pseudo-hSO2 values in the phantom study at 75 %, 50 % and 25 % actual pseudo-SO2 levels. Mean value is represented by horizontal line in the black box; S.D. values are represented by the top and bottom edges of the black box; error bars indicate maximum and minimum values of the pseudo-SO2 values; (d-e) Difference mapping between pseudo-hSO2 and pseudo-cSO2 values for the first and second patients.
