Eccentricity vector evolution over time for the simulations with e = 0, q = 1 binaries (left column); e = 0.45, q = 0.7 binaries (centre column); and e = 0.9, q = 1 binaries (right column). The top panels show the magnitude, and the bottom panels show the phase in radians. The orange and blue lines refer to the simulation with and without the radiation pressure contribution, respectively.