Freeze a Curve
- From the Define panel, click the X vector radio button.
 - 
                Click Freeze on the curve calculator.
                You are prompted for permission to break associativity with referenced vectors.
 - Click Yes.
 - Click the Y vector radio button.
 - 
                Click Freeze on the curve calculator.
                You are prompted for permission to break associativity with referenced vectors.
 - 
                Click Yes.
                Both vectors are frozen and the curve will no longer reflect changes from an external source.