... XTE J1856+053

Based on observations obtained with XMM-Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA.

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...G. Sala

Present address: Dept. de Física i Enginyeria Nuclear, EUETIB, Universitat Politècnica de Catalunya, c/ Compte d'Urgell 187, 08036 Barcelona, Spain

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... M. Ajello

Present address: SLAC, 2575 Sand Hill Road, Menlo Park, CA 94025, and KIPAC, Stanford, CA 94305, USA.

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... Primak

Present address: Skinakas Observatory, Physics Department, University of Crete, PO Box 2208, 71008 Heraklion, Crete, Greece.

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