Calibrated mixing length as a function of [Fe/H] for different methods. The different colored lines show the Salaris-corrected [Fe/H] (calibrated α_mlt relationship; dark blue), the original [Fe/H] (calibrated α_mlt relationship; light blue), and the calibrated α_mlt relationship determined by J. Tayar et al. (2017) using YREC stellar evolution models (black). The contour lines for the Salaris-corrected and original [Fe/H] relationships indicate the density of the APOKASC3 points.