HR diagram (top) for the 0.296 M_⊙, Z = 0.001 model, where each point represents 50 000 years. Also displayed are: the temperature, luminosity, and radius profiles for the same model (middle); and the centre and surface ³He abundances (by mass fraction), along with the mass coordinate of the bottom of the convective envelope and the top of the convective core (bottom). A radiative region is found in between. After about 7 Gyr, this model has evolved to be fully convective.