Comparison between different CaT-[Fe/H] calibrations applied to two independent datasets. The B08-sample (see text) has been analyzed with an empirical correction to a Gaussian fit, whereas our EWs have been determined from a combined Gaussian and Lorentzian function. With respect to the position of the prominent peak in the distribution, a good agreement for the zero-point in [Fe/H] between both sets is obtained when the line-fitting technique in the calibration relation and the scientific sample is the same. In contrast, different line-fitting approaches can result in significant offsets of more than 0.5 dex between the samples.