Astron. Astrophys. 325, 961-971 (1997)

Acknowledgements

J.K. thanks the Astrophysikalisches Institut Potsdam for invitations to Babelsberg during which most of this work was done. We thank our referee B.Elmegreen for his detailed and helpful comments. We also thank the Deutsche Forschungsgemeinschaft for financial support (project He 1487/13-1).

© European Southern Observatory (ESO) 1997

Online publication: April 28, 1998

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