a) [Fe/H], b) [C/H], and c) [C/Fe] in each of the CEMP-s models at the point where the mass of the convective envelope is smallest, i.e. just before first dredge-up. Models with and without radiative levitation are plotted with black and grey symbols, respectively. All values for envelope masses below 10^-7 M_⊙ denote upper or lower limits. The [Fe/H] plot also shows the metallicity evolution in a 0.8 M_⊙ model sequence with no accretion (solid lines). Similarly, the [C/Fe] plot shows the evolution in a model corresponding to M₁ = 1.25 M_⊙, M_2,i = 0.8 M_⊙, and ΔM = 0.05 M_⊙. Both sequences without levitation stop during the first dredge-up. The criterion for being classified as a carbon-enhanced metal-poor star ([C/Fe] ≥ 1.0) is from Beers & Christlieb (2005).