Curve of growth for the Ca line at 8498 Å. Colors show different T_eff. Dashed lines are used for T_eff,phot > 7000 K, and T_eff,phot < 5000 K and log g_phot > 3.0 as they are not included in the final sample given that the Ca lines can be contaminated by hydrogen lines in relatively hot stars and their strengths are not sensitive to the Ca abundance in cool dwarfs (see the two right panels in the bottom row). Similar figures for the other two lines are available in Appendix B.