Most important atomic lines in each strong spectral feature with FORS2 resolution (R ~ 2000). The most important molecular band in this region is MgH around λ = 5165 Å, on top of the Mg i triplet lines. The left panel shows a metal-poor red giant star from the library of Coelho et al. (2005), the right panel shows a metal-rich. The left panels were zoomed in the y-axis direction for better visualization.