... A2124

Tables 2 to 11 are only available in electronic form at the CDS via anonymousftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html

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Figures 2 to 10 are only available in electronic form at http://www.edpsciences.org

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