Mass fraction of ³He at the stellar surface at the end of the second dredge-up as a function of initial stellar mass in standard models (solid lines and triangles) and in models including various prescriptions for mixing in the radiative regions (dashed lines), at two metallicities (Z = 0.0001 and Z = 0.014; left and right panels, respectively). The predictions are from Dearborn et al. (1996, DST96, blue line), Boothroyd & Sackmann (1999, BS99, at the RGB tip, magenta lines), Weiss et al. (1996, WWD96, red triangles), and Lagarde et al. (2011, LC11, black lines). The initial abundances of ³He adopted at the zero age main sequence by the different authors are given on the top right corner of each panel.