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Fig. 6. Vector diagram of the flow around a swimming Rana esculenta results from a digital particle image velocimetry (DPIV) analysis. Each vector shows the direction and relative magnitude of the velocity of the local flow. Maximal velocity is colour coded red, minimal velocity is shown in blue. Extension is not yet initiated and thrust is obtained by slowing down the flow coming towards the frog. This flow is generated during recovery, i.e. flexing the hind limbs behind the frog's body.





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