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Table 3

Summary of the properties of the current and previous metallicity scales.

Scale Total Avg. stars λλ R [Fe/H] Common σ r 2 Polyn.
clusters per cluster (nm) range clusters order

This work 51 16 456–586 2000 [–2.4, 0.0]

Carretta et al. (2009a) 19 100 560–680 20 000–40 000 [–2.4, –0.4] 13 0.07 0.99 1
Zinn & West (1984) 561 (1) 360–570 775 [–2.4, –0.1] 19 0.18 0.93 2
Rutledge et al. (1997) 52 19 725–900 2000 [–2.3, –0.1] 17 0.13 0.97 2
Kraft & Ivans (2003) 11+52 13 614–652 45 000–60 000 [–2.3, –0.7] 10 0.11 0.94 1
Saviane et al. (2012a) 14+203 19 770–950 2440 [–2.3, –0.1] 14 0.12 0.97 2

Notes.The fit parameters of previous metallicity scales against ours are presented. We also give the characteristics of our metallicity scale for comparison.

(1)

They observed integrated spectra of 60 clusters; however, their Table 5 only presents metallicities for 56 objects.

(2)

They analysed spectra of different sources.

(3)

Observations and analysis are homogeneous, and 14 clusters were used for calibration.

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