Astron. Astrophys. 324, 449-456 (1997)

Acknowledgements

One of the authors (D.R.G.) would like to thank the brazilian agency FAPESP for support, and the other authors (A.C.S.F, L.C.J., V.J.P. and R.O.) would like to thank the brazilian agency CNPq for partial support. We thank the anonymous referee whose comments helped us to improve the paper significantly.

© European Southern Observatory (ESO) 1997

Online publication: May 26, 1998

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