Model fit to the 1142.2 nm refractory Fe I line for star HD 260655. The colored lines represent different synthetic spectra, and the fainter gray lines represent the interpolated grid of spectra that was fit to the data, shown as a black dashed line. The best-fit abundance of [Fe/H] = −0.54 is shown as a darker gray line. It tracks the data over the line region very closely, and is delineated on either side by dashed gray lines.