... sphere?¹

Answer: yes, ions can escape, but they will be pushed back once the command cleardrops is executed.

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... system?²

Answer: The system has periodic boundary conditions, therefore its apparent top and lower boundaries are actually the same plane.

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... time?³

Answer: The torque is printed as many times as there are patches containing atoms to which the force is applied. No, it's impossible to collect this information from all patches in a tclBC script. Each instance of the script can only access information about the atoms handled by one processor.

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