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Astron. Astrophys. 344, 721-734 (1999)

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Acknowledgements

We thank Sjur Refsdal, Leon Koopmans, Lutz Wisotzki and many colleagues at Jodrell Bank for helpful comments and suggestions. This research was supported in part by the European Commission, TMR Programme, Research Network Contract ERBFMRXCT96-0034 `CERES'.

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© European Southern Observatory (ESO) 1999

Online publication: March 29, 1999
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