egrations of the outer five planetary orbits using the symplectic map with a stepsize of 400 d， 1/10.83 of the orbital period of jupiter. their result seems to be accurate enough， which partly justifies our method of determining the stepsize. however， since the eccenicity of jupiter (～0.05) is much smaller than that of mercury (～0.2)， we need some care when we compare these integrations simply in terms of stepsizes.
in the integration of the outer five planets (f±)， we fixed the stepsize