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Fig. 2. Two successive wingbeats run continuously together as long as none of the
defining parameters change from wingbeat to wingbeat (black line). However,
changing parameters between wingbeats (
in this instance) creates a
discontinuity at the boundary from one wingbeat to the next (cyan line). A
hyperbolic tangent combines the distinct second wingbeat with the prior
wingbeat (Eqn 4, broken red line) for a smooth transition.