Carbon abundance at main sequence turn-off as a function of specific angular momentum of accreted material in models with rotational mixing only. To avoid excessive crowding, only models with M₁ = 1.25 M_⊙ are plotted, in which [C/H] ≃ 0.38 after mass transfer in all cases. The general result of little to no dilution for j_a ≲ 2 × 10¹⁶ cm²s^-1 holds for systems with other primary masses.