SpT-R (upper panels), SpT-log(L/L_⊙) (middle panels), and SpT-M_sp (bottom panels) calibrations for the 234 stars in the calibrator sample, with columns divided by LC groups. The values were derived from observed absolute magnitudes obtained with distance values and limits from the ALS III work; see Section 2. The error bars take into consideration the propagation of errors in distances, magnitudes, extinction, and spectroscopic parameters. Dashed lines represent the observational scales proposed by M05, while solid lines correspond to the calibrations derived in this work (see definitions in Tables B.3 and B.4). A triangle over the symbol indicates stars excluded from the fit by the σ-clipping procedure.