Examples of the calibration for index 38 (see Table 4). Upper panel: Variation of the measured equivalent widths as a function of T_eff, with the points color-coded by [Fe/H]. The dotted, solid, and dashed black lines represent Equation (1) for log g  = 4.44 and [Fe/H] = −0.50, 0.00, and +0.50, respectively. Lower panel: Variation of the measured equivalent widths as a function of [Fe/H], with the points color-coded by T_eff. The dashed, solid, and dotted black lines represent Equation (1) for log g  = 4.44 and T_eff  = 5000, 5750, and 6500 K, respectively. The calibration accurately represents the observed behavior of the points throughout the parameter space covered by the calibration sample.

(A color version and supplemental data of this figure are available in the online journal.)