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Poincar? map of experimentally measured particle displacements in a 2D time-periodic, chaotic-mixing fluid flow. Red lines indicate large displacement during one period, blue lines small displacement. The 2 circles and 4 crosses are elliptic and hyperbolic fixed points, respectively, in the flow map. [Greg A. Voth, G. Haller, and J. P. Gollub, Phys. Rev. Lett. 88, 254501 (2002)] |


