Examples of low-excitation and high-excitation line pairs used for the LDR method for C1103-10405 (T_eff = 4680 K). The gray line is the observed spectrum, and the dashed red line is a Gaussian fit. We measured the line depth as the maximum height of the fitted line measured from the continuum. The LDR (r) is estimated as the ratio of the line depths of low- and high-excitation lines. The relations between T_eff and r for each pair of Fukue et al. (2015) are listed in the right panels.