... WEBDA

obswww.univie.ac.at/webda - Mermilliod & Paunzen (2003).

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... 2MASS

The Two Micron All Sky Survey - www.ipac.caltech.edu/2mass/releases/allsky/

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... VizieR

vizier.u-strasbg.fr/viz-bin/VizieR?-source=II/246

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... filters

stev.oapd.inaf.it/~lgirardi/cgi-bin/cmd

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...Froebrich et al. (2007a)

Actually, Froebrich et al. (2007a) present core and tidal radii which, in populous clusters is a factor $\sim$2 larger than the RDP radii (Bonatto & Bica 2005).

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