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. 2020 Jan 24;11(2):1073–1091. doi: 10.1364/BOE.382270

Fig. 12.

Fig. 12.

Typical PPG signals of CHbO and CHbR obtained from the scalp of rat under the condition of (a) FiO2=95%, (b) FiO2=21%, (c) FiO2=14%, and (d) FiO2=6%.