... WEBDA

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

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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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... XDSS

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

http://www.ipac.caltech.edu/2mass/releases/allsky/doc/

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...$K_{\rm s}$ filters

http://stev.oapd.inaf.it/cgi-bin/cmd

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... update

http://physun.physics.mcmaster.ca/Globular.html

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...

Although at approximately the same distance from the Sun and absorbed by a similar reddening value, the 2MASS cutoffs of M 4 and NGC 6397 are somewhat different. This occurs because M 4 is projected against the bulge ( $\ell\approx351\hbox{$^\circ$ }$), while NGC 6397 lies at the outskirts ( $\ell\approx338\hbox{$^\circ$ }$).

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... clouds

Molecular clouds more massive than $\sim$ $10^6~\mbox{$M_\odot$ }$ are found in the solar neighbourhood (e.g. Solomon et al. 1987).

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