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Astron. Astrophys. 333, 841-863 (1998)

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Acknowledgements

We are grateful to Chuck Steidel and Patrick Petitjean for allowing us to use some of their data on PKS 1229-021, and also to Murray Lewis and his collaborators who observed for us PKS 0454+039 with the ARECIBO radiotelescope. We also wish to thank Mike Fall for insightful comments on an earlier version of this paper and Ross Cohen, Françoise Combes, Max Pettini and Evelyne Roueff for helpful discussions on various aspects of this work.

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© European Southern Observatory (ESO) 1998

Online publication: April 28, 1998

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