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Fig. 4. Representative graph of the Niroscope data obtained during a 3.5 min submersion of seal A during the trained session. Note the slight increase in total Hb (tHb) and decrease in oxygenated hemoglobin and myoglobin (HbO+MbO). Hb+Mb, deoxygenated hemoglobin and myoglobin. Units for Niroscope data are milli-vanders (mvd); see Fig. 3 legend. Arrows indicate the approximate start and end of the submersion.