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. 2011 Feb 2;278(1718):2654–2661. doi: 10.1098/rspb.2010.2742

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Figure 5. — Cost of transport (COT; J kg⁻¹ m⁻¹) plotted against forward speed (U; m s⁻¹). The polynomials are described by the equations COT = 82.835 − 87.175U + 26.564U² (dotted line through all speeds; F_2,9 = 59.564, r² = 0.93, p < 0.001), COT = 94.312 − 126.343U + 50.805U² (solid line through walking and grounded running data only; F_2,5 = 66.193, r² = 0.96, p < 0.001) and COT = 261.525 − 269.598U + 72.386U² (dashed line through aerial running data only; F_2,1 = 110.557, r² = 0.99, p = 0.067). The areas between the vertical dashed lines (labelled tran) represent the range of speeds where a gait transition occurred.