... WEBDA

http://obswww.unige.ch/webda

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... 2MASS

The Two Micron All Sky Survey, All Sky data release (Skrutskie et al. 1997), available at http://www.ipac.caltech.edu/2mass/releases/allsky/

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... DSS

Extracted from the Canadian Astronomy Data Centre (CADC), at http://cadcwww.dao.nrc.ca/

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... VizieR

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

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... Limit

Following the Level 1 Requirement, according to http://www.ipac.caltech.edu/2mass/releases/allsky/doc/sec6_5a1.html

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...$K_{\rm s}$ filters

http://pleiadi.pd.astro.it/isoc_photsys.01/isoc_photsys.01.html. 2MASS transmission filters produced isochrones very similar to the Johnson ones, with differences of at most 0.01 in (J-H) (Bonatto et al. 2004a).

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