This work is based on observations obtained with XMM-Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA. Optical observations have been obtained with the ESO/MPG 2.2 m at La Silla (Chile) under programs 68.D-0478(A) and 68.D-0478(B).

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Figure 10 and Appendices are only available in electronic form at http://www.aanda.org

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... (WFI)

http://www.ls.eso.org/lasilla/sciops/2p2/E2p2M/WFI/

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... (845)

http://www.ls.eso.org/lasilla/sciops/2p2/E2p2M/WFI/filters/

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... $0\hbox{$.\!\!^{\prime\prime}$ }25$

http://ad.usno.navy.mil/star/star_cats_rec.html

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...Eye

http://terapix.iap.fr

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... team

http://www.ls.eso.org/lasilla/sciops/2p2/E2p2M/WFI/zeropoints/

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...I

see http://www.stsci.edu/ for a more detailed description of the GSC-2 photometric system.

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... interface

http://irsa.ipac.caltech.edu/applications/Gator/

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... $0\hbox{$.\!\!^{\prime\prime}$ }35$

http://www-gsss.stsci.edu/gsc/gsc2/GSC2home.htm

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... $0\hbox{$.\!\!^{\prime\prime}$ }25$

http://spider.ipac.caltech.edu/staff/hlm/2mass/overv/overv.html

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