[Y/Fe] vs. [Na/Fe] and [Rb/Fe] vs. [Na/Fe] for stars from Yong et al. (2008b). Linear fits and the slopes with their significance (in units of σ) are reported. For [Rb/Fe] vs. [Na/Fe] we plotted the mean abundances (red crosses) of the two groups of Na-poor ([Na/Fe] < 0.30 dex) and Na-rich ([Na/Fe] > 0.30 dex) stars.
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