Based on observations obtained at the Canada-France-Hawaii Telescope (CFHT) which is operated by the National Research Council of Canada, the Institut National des Sciences de l'Univers of the Centre National de la Recherche Scientifique of France, and the University of Hawaii.

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Visiting astronomer at the Pic du Midi Telescope Bernard Lyot (USR5026) of Université Paul Sabatier and CNRS Institut National des Sciences de l'Univers.

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