Figure 2From: Design and conduct of Caudwell Xtreme Everest: an observational cohort study of variation in human adaptation to progressive environmental hypoxia Ascent profile, mean barometric pressure and mean PiO2 for Group 1 (Trekkers), Group 2: (Investigators: Climbers and Base Camp Team). Legend: Laboratories where testing was performed are labeled, intermediate altitudes indicate overnight stops without testing.Back to article page