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. 2021 Feb 24;21(5):1586. doi: 10.3390/s21051586

Figure 5.

Figure 5

(a) Absorption coefficient spectra of oxyhemoglobin (HbO2) and deoxyhemoglobin (HHb). (b) The probabilistic trajectory of photons from the source to a detector of incident near-infrared light is described as a “banana shape” [38]. Figure modified from [39].