Modified Bland-Altman plot for Run C, showing the mean of two methods on the x-axis and the ratioon the y-axis. The left column presents the comparison between the literature median and our methods (color-coded) for T_eff (top), log g (middle), and [Fe/H] (bottom). The right column presents the comparison between our methods. Each symbol represents a different combination of our methods, as shown in the legend. For [Fe/H] the y-axis shows the ratio of the number of Fe and H atoms in order to avoid division by zero. See text for details.