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StepSize is an option for SolveFree that sets the constant time-step size used by the numerical integration algorithm.

• The default, StepSize->Automatic, uses an adaptive algorithm that adjusts the time-step size up or down by a factor of two when necessary.
• Specifying a setting other than
Automatic disables the automatic adjustment of step size and uses the specified step size for the entire integration.
• See also: MaxError, StartingStepSize.