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Fig. 4. An expansion of Fig. 3 for
the middle three flaps only, with traced kinematics of the wing stroke
included. The effect of acceleration is highlighted (i) for the
distal wing position, and relates to the high acceleration (up to 80
g) at the `clap' at the upstroke/downstroke transition. The
effects of acceleration-compensation are generally slight for both tail and
wing differential pressure signals.