n our simple dynamical model， seems to be quite stable even over this very long time-span. a closer look at the lowest-frequency oscillations using a low-pass filter shows us the potentially diffusive character of terresial planetary motion， especially that of mercury. the behaviour of the eccenicity of mercury in our integrations is qualitatively similar to the results from jacques laskar's secular perturbation theory (e.g. emax～ 0.35 over ～± 4 gyr). however， there are no apparent secular incre
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