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N. Berglund and C. Case, Rue de Chartres B.P. 6759, 45067 Orléans Cedex 2, France E-mail address: berglund@cpt.univ-mrs.fr Bastien Fernandez CPT?CNRS Luminy Case 907, 13288 Marseille Cedex 9, France E-mail address: fernandez@cpt.univ-mrs.fr Barbara Gentz Weierstraß Institute for Applied Analysis and Stochastics Mohrenstraße 39, 10117 Berlin, Marseille Cedex, vol.907, issue.9, 13288.