Time evolution of e and P_orb for 1 M_⊙ + 1 M_⊙ binaries over a grid of initial orbital periods and initial eccentricities, with our fiducial tides model (top panel) and the Z77 tides model (bottom panel). Each binary is initiated at a grid point, and the colors depict the age of each simulation snapshot in years. The binaries are only evolved up to their MS lifetimes (approximately 10 Gyr) in this section.