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I'm interested in understanding drift error calculation between the known-correct state waypoints for Pluto's orbit. I'm trying to figure out whether there is some unintended asymmetry between the forward calculation and the reverse calculation. I will likely have to compare against TOP2013 data for the major planets, because I am using truncated VSOP87, which also introduces position errors. I should also validate TOP2013 versus VSOP87, both untruncated, for Jupiter..Neptune, which they both cover.