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Astron. Astrophys. 340, 617-625 (1998)

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Acknowledgements

I am very grateful to Dr. K. Werner, the referee, for his comments and corrections to the original version of this paper. This research has been supported by grant No. 2 P03D 013 14 from the Polish Committee for Scientific Research.

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© European Southern Observatory (ESO) 1998

Online publication: November 9, 1998
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