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Fig. 7. Mean values of the power (W, left vertical axis) to impart `useless' kinetic energy to the water (k) and to overcome frictional (d) and inertial forces (int) as measured without fins (L) and with fins (LF) at a speed of 0.9 m s-1. The mean (± 1 S.D.) kick frequency at the same speed is also reported in the two conditions (KF, Hz, closed circles, right vertical axis).