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1 Introduction
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2 Observational campaign
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3 IBIS/ISGRI light curves and spectra
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4 Analysis of precessional and orbital variability of SS433 in the
25-50 keV energy range
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5 Optical and IR photometry
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6 Optical spectroscopy
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7 Spectral type of the optical star
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8 Implications for binary masses
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9 Discussion
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10 Conclusions
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References
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