Comparison between the T_eff values measured in this work and those found in the literature. Left panel: ROTFIT versus APOGEE-2 DR17 T_eff values (Jönsson et al. 2020). The color of symbols distinguishes the three subsamples as in the previous figures and indicated in the legend. The one-to-one relation is shown by the dashed line. The T_eff differences between ROTFIT and APOGEE, ΔT_eff, are displayed in the lower box. Right panel: ROTFIT versus LASP DR11 v1.0 T_eff values (https://www.lamost.org/dr11/v1.0). The meaning of lines and symbols is as in the left panel.