Comparison between the original high resolution spectra (blue) and the low-resolution spectra (red) degraded to R ≈ 200 through Gaussian convolution. Both panels cover the 2550−10 000 Å range, with the left panel showing an MP star with [O/Fe]=0.4, [Mg/Fe]=0.0, T_eff=4700 K, log g=5.0, and [Fe/H]=−2.0, and the right panel showing an MP star with [O/Fe]=0.0, [Mg/Fe]=0.4, and the same other parameters.