Question: The meaning of the expression of 'PIECEWISE''RVAR'.

I made a model in MapleSim(Fig 1).

Here is the custom element named 'FcF' among the model. Its equation is defined as Fig 2.

I analyses
the model in Maple, the part related with the equation of FcF is shown
as Fig 3.

 But I don't understand the expression 'PIECEWISE''RVAR'.

Could anyone explain it.
Think you very much.

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