Top: effective overshoot as a function of the a₁ coefficient for the sample of stars. Here, the a₁ value is determined from the observed frequencies of the stars. The red line is a weighted line of best fit. Bottom: effective overshoot as a function of the a₀ coefficient for the sample of stars. In both panels overshoot is in units of H_P. See Figure 15 in the Appendix for a version of this figure using the input overshoot.