If you use Runge-Kutta integration with automatically adjusted step size, you can specify the acceptable integration error. The acceptable error is used to determine whether decreasing the step size is necessary to achieve the desired integration accuracy. You can specify the absolute and relative tolerances:
ABSOLUTE TOLERANCE = .001
~ Dmnl
~ Absolute change allowed within a TIME STEP.
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RELATIVE TOLERANCE = .001
~ Dmnl
~ Relative change allowed within a TIME STEP.
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The default values for the parameters of .001 will be used if you do not define them within a model. See Chapter 8 for more discussion of the integration techniques.