This paper is based on observations from the ESO/Danish 1.5-m telescope at the La Silla Observatory and on observations made with the Nordic Optical Telescope, operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias.

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Table 1 is only available in electronic form at http://www.edpsciences.org

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