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Increase in red blood corpuscles while several expedition members were at high altitude

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Increase in red blood corpuscles (millions per ml. of blood) while several expedition members were at high altitude (center peaks). The vertical lines represent the dates on which the party left and returned to Lima, Peru (505 feet or 154 meters above sea level). (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.)