Variation of ⁷Li abundance versus luminosity of giant stars. The computed track with Λ_e = 0.5 and solar-scaled mixture is shown in red, with four values of α_th = 0, 50, 100, 150 shown by different line styles. The yellow lines show tracks with Λ_e = 0.6, α_th = 50 using solar-scaled mixture (solid) and [α/Fe] = 0.4 mixtures (dotted). The error bar in the upper right indicates the typical 0.1 dex uncertainty in log L.