Comparison of T_eff values. (a) Comparison between the values of effective temperature in our database of LAMOST spectra and in the literature. Filled symbols represent dwarfs (log g_ROTFIT ≥ 3.5), open symbols represent giants (log g_ROTFIT < 3.5). Different colors have been used for different literature sources, as indicated in the main text. The comparison with the APOGEE and LASP T_eff is shown in the middle (b) and bottom (c) panels, respectively. The dotted lines in the top box of each panel represent one-to-one relationships. The solid lines are linear fits to the data. The differences between ROTFIT and literature parameters are shown in the lower parts of each panel along with their average values and standard deviations. Stars indicated with arrows are discussed in the text.