Difference (LAMOST minus literature) between stellar labels estimated from the LAMOST R ~ 1800 spectra with HOTPAYNE and the literature values deduced from high-resolution spectroscopy for the reference stars, as a function of T_eff. The symbols have the same meanings as in Fig. 11. The differences are likely dominated by the differences between the LTE (this study) and NLTE modeling. See the text for details.