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We are grateful to H. Zinnecker, J. Schmitt, E. Martín, and G. Rieke for useful discussion about BDs, ESO for allocation of telescope time, C. Lidman and G. Carraro for allowing the use of their telescope time, A. Burrows and F. D'Antona for providing their new pre-main-sequence tracks, E. Feigelson for allowing the use of his ROSAT observation, the second processing of which is not yet publicly available, and B. Stelzer and T. Hearty for part of the specific software development. ROSAT is supported by the German government (BMBF/ DLR) and the Max-Planck-Society.
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