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Fig. 4. Force profile in N on the feet of a swimming frog through time in % of total extension time. Average force profile is shown as a solid line; dotted lines indicate ± S.D. (A) Calculated based on the displacements of the centre of mass (COM) of the frog with and without drag. (B) Measured using an impulse–momentum approach based on the DPIV data. (C) Measured using a force plate.





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