d of the innermost planet (mercury). as for the determination of stepsize， we partly follow the previous numerical integration of all nine planets in sussman & wisdom (1988， 7.2 d) and saha & tremaine (1994， 225/32 d). we rounded the decimal part of the their stepsizes to 8 to make the stepsize a multiple of 2 in order to reduce the accumulation of round-off error in the computation processes. in relation to this， wisdom & holman (1991) performed numerical int
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