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(. Fontaine and . Irmar, 263 avenue du Général Leclerc CS 74205 35042 Rennes Cedex, FRANCE E-mail address: marine.fontaine@ens-rennes.fr (Mohammed Lemou) CNRS, IRMAR, Université de Rennes 1, Campus de Beaulieu, 263 avenue du Général Leclerc CS 74205 35042 Rennes Cedex, FRANCE E-mail address: mohammed.lemou@univ-rennes1.fr