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Relation of oxygen pressure in alveolar air to that in arterial blood (x) at different altitudes for different members of the expedition

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(Source: Barcroft J, Binger CA, Bock AV, et al. Observations upon the effect of high altitude on the physiological processes of the human body, carried out in the Peruvian Andes, chiefly at Cerro de Pasco. Philos Trans R Soc Lond B 1923;211:351-480. Public domain.)