Predicted corrections to Δν as a function of ν_max for isochrones with details in the text and in legend of Figs. 1 and 7. For clarity, not all isochrones are shown. For reference, the stable HeCB phase begins approximately at the point (93, 1.004) and continues to the right for the dark green solid 0.43 Gyr isochrone. The vertical black lines mark the measured ν_max values for the NGC 6866 giants.