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Astron. Astrophys. 332, 569-574 (1998)

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Acknowledgements

This research program is supported by a RGC grant of Hong Kong Government and a CRCG grant of The University of Hong Kong, and partially supported by NSF of P.R.C.. We thank J. Gil for his useful suggestions and P.K. Mackeown for a critical reading. The kind help of L. Zhang is highly appreciated.

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© European Southern Observatory (ESO) 1998

Online publication: March 23, 1998
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