Evolution and abundances of a M_2,i = 0.75 M_⊙ secondary accreting ΔM = 0.05 M_⊙ of material from a M₁ = 1.25 M_⊙ primary. The labels highlight specific parts of the evolution discussed in the text. The model sequences with and without radiative levitation overlap at this scale of the HRD. Interior abundance profiles are shown at a few of the stages indicated in the upper panels: before mass transfer (“1”, solid); before thermohaline mixing (“4”, long-dashed); after thermohaline mixing (“5”, dotted); post-mass-transfer main sequence (“6”, dot-dashed); minimum of convective envelope mass (“7”, dot-dot-dashed); during first dredge-up (“9”, short-dashed). The vertical lines in the lower panels indicate the position of the base of the convective envelope at the respective time. The interior profiles of carbon with and without levitation nearly coincide, and only the case with levitation is shown.