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Figure 7


Fig. 7. Comparison of the two methods, VS (flow noise) and VK (kinematics), used to estimate speed of the body during descent and ascent (dark grey dots). The slope of the least-squares linear regression (blue line; N=4062, r2=0.91, P<0.001) through all data points is not significantly different from unity (red line). Note that VS tends to underestimate VK at speeds greater than 5 m s–1, the highest speed for which flow noise was recorded by the towed wing (Fig. 3).





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