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1 Introduction
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2 X-ray observations
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3 Multiwavelength correlation and spectral classification
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4 The high mass stellar sources
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5 Low mass pre-main sequence stars
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6 The binary fraction of Wd 1 in context
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7 Accretion onto relativistic objects
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8 Concluding remarks
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References
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Online Material
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Appendix A: Spectral classifiction of X-ray counterparts
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