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Fig. 3

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Mean Ni (lower panel), and Cr (upper panel) abundance ratios for NGC 4337 giants (filled black squares), compared with thin-disc stars (large red open circles), thick-disc stars (grey symbols), and inner disc open clusters (Magrini et al. 2010, blue triangles), Magrini et al. (2014, green empty circles), and Trumpler 20 (black filled circle).

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