Comparison among the surface lithium abundance obtained with our reference set of tracks (solid line) and models with different assumptions on the adopted physical inputs, for M = 0.6, 0.8, 1.0, and 1.2 M_⊙ with Z = 0.01291, Y = 0.274, and α = 1. Upper panel: effect of the change of the solar mixture (GN93, GS98, AS05, and AS09 ones) in the opacity tables. Bottom panel: effect of adopting the OPAL 2006 and PTEH EOS.