Fig. 1.
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Distribution of [Na/H] versus [O/H] for all OCs with at least four stars with valid values. The blue points for two clusters indicate dwarf stars, while all red points are for giants. The bottom right panel displays the available values in all OCs (in orange) compared to the GC 47 Tuc (grey points). Average error bars are displayed only in the first column of the plots.
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