... clusters

Based on data collected at the European Southern Observatory with the VLT-UT2, Paranal, Chile (ESO-LP 165.L-0263).

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... metallicities

We use the usual spectroscopic notations where $[{\rm A/B}] \equiv {\log}_{10} (N_{\rm A}/N_{\rm B}) - {\log}_{10} {(N_{\rm A}/N_{\rm B})}_{\odot}$, and $\log \epsilon ({\rm A}) \equiv {\log}_{10} (N_{\rm A}/N_{\rm H}) + 12.0$, for two elements A and B. We assume that the term "metallicity'' is equivalent to the stellar $[{\rm Fe/H}]$ value.

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... ESO-MIDAS

European Southern Observatory Munich Image Data Analysis System, http://www.eso.org/projects/esomidas/

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