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1 Introduction
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2 Observations and data reductions
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3 Improving the ephemeris, known values of binary component masses, and
spectroscopic separation of the stellar components
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4 Observed properties of the circumstellar matter
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5 Known system properties
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6 Modelling software
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7 The system model
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8 A possible accretion disk model
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9 Discussion and summary
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References
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