Eccentricity versus semi-major axis plot for case 1 models of RU Cen. These models are similar to the middle panel of Fig. 4, except the initial eccentricity is allowed to be non-zero. The star must remain inside its Roche lobe during its evolution. Starting points are given by a small circle, the end points are shown as open symbols. For T₀ = 4500 K the orbital parameters hardly change and coincide with the observed point.