Astron. Astrophys. 318, 667-672 (1997)

Acknowledgements

GB acknowledges support by SFB 375. YPJ would like to thank the Alexander-von-Humboldt Foundation for a Research Fellowship. He also thanks Max-Planck Institute für Astrophysik for financial support during the final stage of this work. We thank the referee, F.R. Bouchet, for insightful comments.

© European Southern Observatory (ESO) 1997

Online publication: July 3, 1998
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