Table 6: Some [Fe/H] determinations of the globular cluster M 92 measured by different authors in different epochs.
Reference [Fe/H] $_{\rm dex}$ error $_{\rm dex}$
Wallerstein & Helfer (1966) -2.1  
Harris & Racine (1979) -2.12 $\pm$0.2
Zinn (1980a) -2.19 $\pm$0.1
Zinn & West (1984) -2.24 $\pm$0.08
Harris (1996) -2.28  
Gratton et al. (1997) -2.16 $\pm$0.07
Smriglio et al. (this paper) -2.11 $\pm$0.14


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