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Astron. Astrophys. 328, 471-482 (1997)
Acknowledgements
It is a pleasure to thank J. Kamphuis, J. Stil and F. Sloff for making their results available in advance of publication, and J.B.G.M. Bloemen for drawing attention to the Galactic results.
© European Southern Observatory (ESO) 1997
Online publication: March 26, 1998
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