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1 Introduction
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2 Basic equations
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3 Numerical method
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4 Numerical results
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5 Summary
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References
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Appendix A: Derivation of the wave equations
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Appendix B: Formulas for quantities in the wave Eqs. (16)
and (17)
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Appendix C: Expressions for the perturbed variables and forces
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Appendix D: Formulas related to the numerical solution
of the wave equations
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