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Fig. 4

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Cobalt line in four stars: 2M17392719-2310311 (b14), 2M17552744-3228019 (b19), 2M17532599-2053304 (c5), and 2M17503065-2313234 (c28). The synthetic spectra were computed with [Co/Fe]=−0.3 (red), 0.0 (cyan), +0.3 (blue), the APOGEE value indicated in the panels (green), and the final value (magenta), and are compared with the observed spectrum (black).

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