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Article Contents
1 Introduction
2 Theory
3 Absorption models
4 Application to the variable absorption towards PKS 1127-145
5 Discussion
6 Conclusions
Online Material
Appendix A: Time scales for superluminal motion of a background source relative to an intervening absorbing medium
Appendix B: Average power spectrum for a large number of absorbers in front of a compact source
Appendix C: The average mean square visibility due to a random absorbing or emitting medium

List of figures

Copyright ESO 2005
Published by EDP Sciences