Acknowledgements
The authors kindly thank Ian Glass for his useful comments and J.L. Chevassut, F. Tanguy and K. Weestra for their technical support, the whole DENIS staff and all the DENIS observers who collected the data. The DENIS project is supported by the SCIENCE and the Human Capital and Mobility plans of the European Commission under grants CT920791 and CT940627 in France, by l'Institut National des Sciences de l'Univers, the Ministère de l'Éducation Nationale and the Centre National de la Recherche Scientifique (CNRS) in France, by the State of Baden-Württemberg in Germany, by the DGICYT in Spain, by the Sterrewacht Leiden in Holland, by the Consiglio Nazionale delle Ricerche (CNR) in Italy, by the Fonds zur Förderung der wissenschaftlichen Forschung and Bundesministerium für Wissenschaft und Forschung in Austria, by the Fundation for the development of Scientific Research of the State São Paulo (FAPESP) in Brazil, by the OKTA grants F-4239 and F-013990 in Hungary, and by the ESO C & EE grant A-04-046.
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