Astron. Astrophys. 324, 1-10 (1997)

Acknowledgements

We wish to thank Professor Andrea Ferrara for numerous helpful and clarifying comments. We are especially grateful to Gustavo Yepes for productive discussions. REK was supported by a Fellowship (Ka1181/1-1) from the DFG (Germany).

© European Southern Observatory (ESO) 1997

Online publication: May 26, 1998

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