Abundance ratios between neutron-capture elements and α-elements for the sample stars and for bulge stars. Upper panel: [Y/O] and [Ba/O] abundance ratios vs. [Fe/H] (left) and [O/H] (right). Lower panel: [Y/Mg] and [Ba/Mg] abundance ratios vs. [Fe/H] (left) and [Mg/H] (right). The notation is the same as in Fig. 17.
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