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Astron. Astrophys. 351, 368-372 (1999)

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Acknowledgements

The author would like to thank an anonymous referee for his/her constructive comments that helped to improve the paper significantly. This work was supported in part by a grant from the Panden Project and a grant from the National Natural Science Foundation of China.

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© European Southern Observatory (ESO) 1999

Online publication: November 2, 1999
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