Based on data obtained using the MuSiCoS spectropolarimeter at Pic du Midi Observatory, France, from the European Southern Observatory telescopes obtained from the ESO/ST-ECF Science Archive Facility, and from 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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Table 1 is only available in electronic form at http://www.edpsciences.org

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... preparation)

For more details about this instrument, the reader is invited to visit www.ast.obs-mip.fr/projets/espadons/espadons.html

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... level

Confidence intervals were obtained using $\chi ^2$ probabilities from Press et al. (1992). According to these tables, the 99% confidence interval, considering three model parameters, corresponds to an increase in total $\chi ^2$ of 11.3.

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... velocity

This allows for an independent determination of $v\sin i=52\pm 2$ km s^-1.

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... than H9

Where index 9 refers to the quantum number of the upper level in the transition.

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