Label differences Δl = l_lit − l between literature results from high-resolution spectroscopy and this work, plotted against T_eff. Coloured symbols denote benchmark stars with high-resolution data, where colour intensity corresponds to label values. Circles indicate stars with LAMOST LRS spectra, while empty squares represent spectra mimicked from high-resolution observations. Error bars and upper limits reflect uncertainties from Przybilla et al. (2006), Takeda et al. (2008), and Gebruers et al. (2021).