Given the following state-space model:

der(**x**) =
**f**(**x**,t);

Time reversal can be achieved by placing a minus sign in front of each state equation:

der(**x**) =
-**f**(**x**,t);

The *Reverse_Level* model contains a modulating variable
**dir** that determines the direction of time flow:

der(**x**) =
dir***f**(**x**,t);

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