Fig. 5.

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Spectral region around the Al doublet at 7835–7836 Å for sample stars with similar atmospheric parameters. The solid blue lines denote stars belonging to the Mg-poor group in the MP subpopulation, whereas the dashed green lines represent again Mg-poor stars but in the M-int1 subpopulation. A clear difference in the strength of the Al lines can be appreciated between the two metallicity subgroups.
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