The average Al abundances for the two subpopulations differ by 0.13 ± 0.18 dex, where the large dispersion in the N-poor group dominates the uncertainty and thus precludes us from drawing any firm conclusion, although an anticorrelation is formally highly significant at 4σ.
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Atomic diffusion and mixing in old stars - VIII. Chemical abundance variations in the globular cluster M4 (NGC 6121).
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