Fig. 2
Upper panel: comparison of the observed spectra for star 44939 (solid line, [Al/Fe] = –0.19 dex) and star 35999 (dotted line, [Al/Fe] = +1.06 dex). The thin blue solid line is the synthetic spectrum with no Al ([Al/Fe] = –9.99) computed with the atmospheric parameters relative to star 35999. Middle panel: the same for star 22360 (solid line, [Al/Fe] < −0.09) and star 31520 (dotted line, [Al/Fe] = +0.44). Lower panel: co-added spectrum of the 10 stars with highest S/N. The areas hatched in red and light blue mark the regions used to evaluate the flux appropriate for Al lines as discussed in the text; red is the in-line region, light blue indicates the reference for the continuum.
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