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Fig. 7.
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[Mg/Mn] vs. [Al/Fe] chemical ratios of APOGEE stars verifying our selection criteria, color coded based on the stellar density. Overplotted in red are our selected thin-disc-like sample with metallicities below [Fe/H] < −1 (left panel), −1 < [Fe/H] < −0.7 (middle panel), and −0.7 < [Fe/H] < −0.55 (right panel).
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