Left panel: the position of β Hyi in the HR diagram. The constraints on the fundamental parameters (T_eff, L/L_⊙) are indicated by the 1-σ error box (solid) and on the radius by diagonal solid lines. We also show the corresponding 3-σ uncertainties by dashed lines. Two evolutionary tracks for the best models found by method 2 (cf. Table 5) are plotted with dash-dotted and solid curves, representing the models with and without gravitational settling and diffusion, respectively. Right panel: the same as in the left panel but zoomed in. The selected models are marked by filled squares.