Results from the literature. Comparison of hydrodynamic simulations of an equal-mass binary and different eccentricities in a circumbinary disk from S23b (red), Z21 (green) and DD21 (blue). The dots correspond to the simulations and the solid lines correspond to our interpolation. The top panel shows the value of the derivative of the semi-major axis a′, while the bottom panel shows the derivative of the eccentricity e′. Vertical dotted lines mark the value of the equilibrium eccentricity, where e′ = 0.