Diagnostic diagram [Fe/H] vs. [Ba/H] for the stellar components in NGC 1851. The different symbols and colour coding show the results of the cluster analysis using Fe and Ba abundance as parameters (see text). Stars indicated with orange filled squares are attributed to the MR component; stars indicated with green filled triangles are assigned to the MP component. The dotted line indicates the average value [Fe/H] = −1.16 dex for NGC 1851 that we previously adopted as a separating value.
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