These simulations have a duration of 513 time steps.
At t=0 just one particle starts moving (on the right-hand side and halfway up).
Between t=256 and t=257, all velocities are reversed.
The reversibility of the computations depends on the number of particles:
192 particles: reversibility.
336 particles: non reversibility.
768 particles: non reversibility.
1376 particles: non reversibility.
See a related picture:
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