Cuadro de texto: The precise location and shape of the lines depends on details of the forcings, initialization of the ocean model, … Do these lines provide some statistical descriptor useful to quantify ocean dynamics in a more robust way? Cuadro de texto: A measure of mixing strenght : “counting the strongest hyperbolic points in a region” Cuadro de texto: l+(x,t): FSLE from forward integration Cuadro de texto: l-(x,t): FSLE from backwards integration Cuadro de texto: 16

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