Orbital evolution of (a) eccentricities and (b) semi-major axes for the inner and outer planets over 100 Myr (dataset B, Run 1, χ_ν, min²). (c) The temporal variation of the χ_ν, min² fitting curve (dataset B, Run 1) over the first 152 years is represented by five sets of parameters, each corresponding to a complete outer orbit revolution (38 years). The black synthetic curve is the Keplerian (kinematic) fit from which this dynamical model was initialized, and it appears to be in absolute agreement with the first 38 years of orbital evolution (green curve) and in close agreement with the subsequent fits (blue and red curves).