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tokens: Acknowledgments The work of A.F. Seleznev and the science leave of G. Carraro in Ekaterinburg was supported by Act 211 Government of the Russian Federation, contract No. 02.A03.21.0006 and by the ESO DGDF programme. G. Baume acknowledges support from CONICET (PIP 112-201101-00301) and financial support from the ESO visitor programme that allowed a visit to ESO premises in Chile, where part of this work was done. This publication also made use of data from the Two-Micron All-Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. We thank the Centre de Donnes Astronomiques de Strasbourg (CDS), the US Naval Observatory and NASA for the use of their electronic facilities, especially SIMBAD, ViZier and ADS, and the WEBDA data base. This work was based on observations obtained at the Cerro Tololo Inter-American Observatory, Chile, and at ESO Paranal Observatory under programme 292.D-5043.