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Fig. 3. The linear relationships between added drag (Da) and rate of oxygen consumption (O2) obtained from a subject swimming with fins at the indicated speeds. Active body drag Db was estimated, at each speed, by extrapolating the Da versus O2 relationship to O2rest (basal metabolic rate, BMR) as indicated by the dotted lines and the arrows pointing downwards. Da=0 corresponds to free swimming (see text for details).