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Fig. 4


Comparison of [Fe/H] from this work with those from C09 for the 13 clusters in common plus NGC 6553 from C01 and Z04, and NGC 6528 from C99, M03, and AB06. The black line is the one-to-one relation and the blue line is the linear fit to the 15 black points (Eq. (2)). Residuals are presented in the bottom panels. The blue dashed lines represent ± 1σ. Metallicities adopted by Carretta et al. (2001) are shown in red for reference, but they are not considered in the fit. Values are listed in Table 2.

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