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Boxplots of xenon gas transfer ratios from patients at visits 1 to 4 as well as metrics from an age- and sex-matched healthy cohort. Open circles denote data > 1.5 interquartile range; star denotes data > 3 interquartile range. M = membrane.; M:gas = membrane to gas fraction; RBC:gas = RBC to gas fraction; RBC:M = RBC to membrane fraction.
