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Fig. 4

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Comparison between the CN S3839 and the S4142 indices. Each panel shows measurements for the indicated cluster, and the median errobar is also shown in the lower right corner. Clusters are sorted by metallicity, from the most metal-poor (top-left) to the most metal-rich (bottom-right). Dotted lines are linear fits with a fixed slope (that of the whole sample) and rougly adjusted zeropoints.

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