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V. Bonnaillie-noël, CNRS, 2 rue de la Houssinière, BP 92208, F-44322 Nantes cedex 3, France E-mail address: herau@univ-nantes.fr (N. Raymond) Laboratoire Angevin de Recherche en Mathématiques, LAREMA, UMR 6093, UNIV Angers, Département de mathématiques et applications, École normale supérieure, CNRS, Université PSL, F-75005