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. 2015 Apr 6;12(105):20141394. doi: 10.1098/rsif.2014.1394

Figure 4.

Figure 4.

Mean vorticity (Inline graphic, a) and cycle-to-cycle variance (TKE, b) at five phases. The mean velocity field is shown as the vector field for reference in the left-hand figure (NB: only every fourth vector is shown for clarity).