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Mean flow during normocapnia (p<jats:sub>a<\/jats:sub>CO<jats:sub>2<\/jats:sub> = 39 \u00b1 4 mm Hg) and hypercapnia (p<jats:sub>a<\/jats:sub>CO<jats:sub>2<\/jats:sub> = 62 \u00b1 4 mm Hg) was 53 \u00b1 20 ml\/100 gmin and 140 \u00b1 36 ml\/100 g\u2010min, respectively. Fast flows in normocapnia were 94 \u00b1 13 and 182 \u00b1 39 ml\/100 g\u2010min in hypercapnia. 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