... field

Based on observations collected at the European Southern Observatory New Technology Telescope, La Silla, Chile, programme 075.A-0752(A), on data obtained with the European Southern Observatory Very Large Telescope, Paranal, Chile, programme 070.A-9007(A), and on observations obtained with MegaPrime/MegaCam, a joint project of CFHT and CEA/DAPNIA, at the Canada-France-Hawaii Telescope (CFHT), which is operated by the National Research Council (NRC) of Canada, the Institut National des Science de l'Univers of the Centre National de la Recherche Scientifique (CNRS) of France, and the University of Hawaii. This work is based in part on data products produced at TERAPIX and the Canadian Astronomy Data Centre as part of the Canada-France-Hawaii Telescope Legacy Survey, a collaborative project of NRC and CNRS.

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... IRAF

IRAF is distributed by the National Optical Astronomy Observatories, which are operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the National Science Foundation.

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... observations

See SOFI web page: www.ls.eso.org/lasilla/sciops/ntt/sofi/index.html

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... SWarp

Software developped by E. Bertin and available at the URL http://terapix.iap.fr

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... limit

Hereafter we refer to the 90% and 50% limits as the ``completeness limit'' and the ``limiting magnitude'' of our survey.

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..._Phare

http://www.lam.oamp.fr/arnouts/LE_PHARE.html

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... magnitudes

Magnitudes were measured in all bands with SExtractor in double-image mode, by using the $\chi ^2$ image as detection image.

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... VISTA

http://www.vista.ac.uk

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