HE 0144−4657, as observed from HES (top left), NTT/EFOSC2 (second row from the top left), and Magellan/MIKE (bottom two rows). The different color lines reference the same regions in each spectrum, highlighting the difference in resolution. Absorption features and molecular bands of interest are labeled throughout. Top-right panel: T_eff versus ﹩\mathrm{log}\,g﹩ for HE 0144−4657 (blue circle), together with data from P. S. Barklem et al. (2005; gray squares, with green highlights for RHB stars). Solid lines show YY isochrones from P. Demarque et al. (2004) with 12 Gyr, 0.8 M_⊙, [α/Fe] = +0.4, and [Fe/H] = −2.0, −2.5, and −3.0. The horizontal-branch tracks were taken from A. Dotter et al. (2008). The inset shows ξ (km s⁻¹) versus ﹩\mathrm{log}\,g﹩ for the same objects.