Portion of Qatar-1 average spectrum (black solid line) and synthetic spectrum (red solid line) couplcorresponding to the following set of (fixed) parameters: T_eff = 4910 K, log g = 4.66, ξ = 0.90 km s^-1, and vsinI = 1.7 km s^-1. The positions of five iron lines and two lines of titanium and calcium are marked. The inset shows a zoom on the spectral window containing three Fe i lines, and the comparison with synthetic spectra corresponding to [Fe i/H] = 0.10 (green, long-dashed line), 0.20 (red, solid line), and 0.30 (blue, dotted line).