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1 Introduction
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2 Physical properties of S stars
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3 Chemical equilibrium composition of the gas phase
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4 Chemical equilibrium condensation
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5 Nucleation
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6 Non-equilibrium condensation
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7 Model calculation
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8 Concluding remarks
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Appendix A: Extinction by dust grains
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Appendix B: Thermodynamic data for Fe-Si compounds
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References
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