Eccentricity plotted as a function of the semi-major axis for various disc and binary configurations (cf. Sect. 4.1 for the fiducial parameter values). The blue line uses e₀ = 0.01 for the initial eccentricity, the green e₀ = 0.3, and the magenta e₀ = 0.7. The viscosity parameter α is set to α = 0.01 in the green dashed line and to α = 0.3 in the green dotted line. The gas fraction f_g is set to f_g = 0.05 in the magenta dashed line and to f_g = 0.5 in the magenta dotted line.