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Fig. 1. Baseline blood flow over the dorsal and abdominal skin. (A)
Winter-acclimatized (WAC) pigeons (95% confidence interval 171.9 to
81.17). (B) Thermally non-challenged (NOC) pigeons (95% confidence
interval 89.69 to 22.47). BPU, blood perfusion unit. The box
extends from the 25th to the 75th percentile, with a line at the median (50th
percentile). The `whiskers' extend above and below the box to show the highest
and lowest values.