Fitting procedure for the Teff calibration using the ratio, R_EW, between the EW of lines V i (5670.85 Å) and Fe i (5635.83 Å). We also show the fit for the inverse of the ratio, 1 /R_EW, and the logarithm of the ratio, log R_EW. The final number of stars used in the fit, the standard deviation of the linear fit, L_σ, and of the third-degree polynomial fit, P_σ. The log g of each star is colour-coded.
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