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Astron. Astrophys. 359, 1139-1146 (2000)
Acknowledgements
This research has been supported by the ECOS program of collaboration between France and Chile under grant C97U03. M.R. acknowledges support from FONDECYT (Chile) grant No1990881 and No7990042.
© European Southern Observatory (ESO) 2000
Online publication: July 13, 2000
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