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1 Introduction
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2 The sample
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3 Observational data
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4 The circumstellar model
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5 CO line modelling
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6 Dust radiative transfer and dynamical model
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7 Results
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8 Individual objects
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9 Discussion
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10 Conclusions
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References
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Online Material
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Appendix A: A new mass loss rate formula
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Appendix B: Photometric fluxes and dust radiative transfer
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Appendix C: Results from the CO line radiative transfer model
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