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Article Contents
1 Introduction
2 Ratio of P1/2P2 for fast modes
3 Ratio of P1/2P2 for slow modes: the Klein-Gordon equation
4 Comparison with observational data
5 Discussion and conclusion
References
Online Material
Appendix A: Derivation of Eqs. (1)-(3)

List of figures

Copyright ESO 2006
Published by EDP Sciences