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À. D. Gibert and G. Rennes, Université Rennes 1, B15 Campus de Beaulieu, F-35042 Rennes cedex, France. (gibert@univ-rennes1.fr) P. Sailhac, Laboratoire de Proche Surface (CNRS, UMR 7516), EOST- IPGS, 5 rue René Descartes, F-67084