Image Details
Caption: Figure 9.
Comparison of a section of the APOGEE spectra for two stars of the same temperature (approximately 4060 K) with about a 100× ratio in the abundance of iron. The red (top) spectrum is for a star that has [Fe/H] = −1.68 and ﹩\mathrm{log}g=0.40﹩. The black (bottom) spectrum is for a star that has [Fe/H] = +0.28 and ﹩\mathrm{log}g=1.39﹩ (DR12 values).
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