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Fig. 2. (A) Water loss ratios plotted against apnea duration for all seals. Apnea
duration is a highly significant contributor to the ANCOVA model for
respiratory evaporative water loss/metabolic water production (REWL/MWP;
F=65, P <<0.001). (B) Metabolic rate versus apnea
duration. (C) Total respiratory evaporative water loss (EW_Total) plotted
against total oxygen consumption (O2_Con). Each data point denotes
a single breathing interval (apnea + recovery, or W-phase eupnea with no
preceding apnea, as defined in Materials and methods), and the values for
water loss and oxygen consumption are the amounts lost or consumed during that
discrete interval. In the analysis, breathing intervals in which apnea
duration was less than 1 min were considered W-phase breathing; an apnea
duration of 0 min indicates a W-phase breathing interval in which no apnea
took place.