Comparison between the T_eff computed in this work and the spectroscopic values with the So12 calibration (top panel) and the Te16 calibration (middle panel) for the joint sample. The line in the two plots represents the identity line, the standard deviation is plotted as the cross in both panels. In the bottom panel we show the difference between the Te16 calibration and the spectroscopic T_eff as a function of T_eff, the error bars represent the errors in our computation. The plots are colour-coded for log g.