a) Difference between the spectroscopic temperatures and the temperatures from microlensing techniques versus effective temperature, and b) the difference between (V − I)₀ colours determined from microlensing techniques and those that can be determined from the spectroscopic temperatures using the IRFM calibration by Casagrande et al. (2010). The average differences are  ⟨ ΔT_eff ⟩  = −80 K with a dispersion of 217 K, and  ⟨ Δ(V − I)₀ ⟩  = 0.026 with a dispersion of 0.073 mag. The three stars that show largest deviations between microlensing and spectroscopic parameters are marked. For MOA-2010-BLG-311S (mb10311) the original values are shown with open circles, and the corrected value with filled circles (connected with the original values by a dash-dotted line).