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Why Do Kestrels Soar?

Fig 5

Partial effect of solar radiation in the model fitted to mean cross-country speed of lesser kestrel commuting flights.

A penalized smoothing spline of 3.12 degrees of freedom was adjusted to solar radiation. Grey shading represents the standard error of the mean effect. Sample size = 2891 commuting flights.

Fig 5

doi: https://doi.org/10.1371/journal.pone.0145402.g005