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If a water molecule enters or exits the defined region within a picosecond , only the portion of its displacement within the region contributes to the sum.
You're frozen in that second, that nanosecond—even a picosecond , maybe.
We also define a coordinate, X, by cumulating the sum of one-dimensional displacements of all water molecules in the mentioned region every picosecond .
Trajectory snapshots were saved every picosecond .
the first picosecond of the Big Bang
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