Typical fits of a spectrum (ID = id000010747jd2456866p4985f000). The fit, performed over the complete wavelength range, 4750–9300 Å, returned T_eff = 5471 K and [Fe/H]_e = −1.84 dex for global rms residuals of 0.01 for both GSL and AP18. The left column shows the [α/Fe] = 0.4 dex GSL grid, and the right column presents the [α/Fe] = 0.5 dex fine AP18 grid. The top row shows a small wavelength region around the H_β line, the middle row shows a region around the Mg_b triplet, and the bottom one shows a region around the Ca II triplet. For each plot, the top panel presents the observation (black line) with the best-fit model over-plotted in red. The bottom panel presents the residuals, observation minus model.