Application of the 2σ cut to the ratio between the EW of line Si i (6142.49 Å) and of the EW of Ti i (6126.22 Å). The green line represents the third-degree polynomial fit, the dashed blue line represents the 2σ interval, and the black dots are the stars removed by the procedure. The vertical axis represents the spectroscopic Teff and the horizontal axis represents the value of the EW ratios. The value of the final σ of the fit, P_σ, is ~82 K. The log g of each star is colour-coded.
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