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Absorption spectra of oxygenated (HbO2) and deoxygenated (HHb) haemoglobin between the visible and near-infra-red region. Molar extinction coefficients of both haemoglobin species are shown with respect to the wavelengths of interest in pulse (Kyriacou and Allen 2021). Reprinted from Kyriacou et al 2022, Copyright (2022), with permission from Elsevier.
