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Fig. 4. Ratio of values in cold-acclimated/control animals for maximum metabolic rate (O2max) respiratory frequency (f), tidal volume (VT), minute volume (VMIN) and oxygen extraction (OEE) throughout acclimation. Ratios were calculated after taking body mass into account (values were expressed on a per gram basis). The straight horizontal line represents a 1:1 ratio and the broken vertical line indicates when cold-acclimation began.