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Fig. 11. Speed of wingtip marker (A), wrist marker (B) in the body coordinate
system, angle of attack (C) and wrist angle (D) over a standardized
wingstroke. Red, blue and grey traces represent the inside and the outside
wing and the difference between them, respectively. The width of the traces
corresponds to the 95% CI (confidence interval). Shaded bars correspond to
downstroke periods.