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1 Introduction
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2 Observation and data analysis
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3 Comparison with Chandra source detections
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4 IR properties of the XMM-Newton sources
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5 X-ray detection of young bona fide brown dwarfs
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6 X-ray properties of Young Stellar Objects in the  Ophiuchi cloud
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7 Summary and conclusions
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References
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Online Material
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Appendix A: Method to compute the X-ray count rate upper limit
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Appendix B: Comparison between Chandra and XMM-Newton determination of
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