Astron. Astrophys. 364, 26-42 (2000)

Acknowledgements

We are grateful to the referee, Dave Thompson, for his useful comments, and to Lucia Pozzetti for the computations provided. This work was partially funded by the C.N.A.A. grant n. 3/98 to G.M.

© European Southern Observatory (ESO) 2000

Online publication: December 15, 2000
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