Mean [Al/Fe] cluster abundances, computed using only the member stars, as a function of stellar mass. The new observations are shown as red diamond symbols. The typical standard deviation of the mean [Al/Fe], ±0.03 dex, is shown as an error bar. The data of the Gaia-ESO clusters (blue symbols) are from Smiljanic et al. (2016), Overbeek et al. (2017), and Tang et al. (2017). The turn-off mass uncertainty is expected to be less than ± 0.2 M⊙.
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