Surface abundances by mass fraction at the onset of stable He burning in terms of the mass at He ignition (full lines). The typical abundances of the He core after the primary He flash has ended, but before the He subflashes (dashed lines), are shown for comparison. Upper panel: corresponds to initial chemical compositions of Z = 0.02 and Y = 0.285. Lower panel: corresponds to initial chemical compositions of Z = 0.001 and Y = 0.247.