Astron. Astrophys. 335, 303-308 (1998)

Acknowledgements

Two of us (A.C. and R.R.) acknowledge support of the grant 2 P03C 002 08 from Komitet Badan Naukowych and wish to thank the Max-Planck-Institute fuer Aeronomie in Lindau for hospitality.

© European Southern Observatory (ESO) 1998

Online publication: June 12, 1998

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