Astron. Astrophys. 360, 76-84 (2000)

Acknowledgements

The authors acknowledge very useful discussions with Dr. E. Pignatelli and Prof. L. Danese. Moreover we thank an anonymous referee for his detailed comments on the first version of this paper. We acknowledge financial support from Italian Ministery of Research, University, Science and Technology (MURST).

© European Southern Observatory (ESO) 2000

Online publication: July 27, 2000
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