Add a Curve
- 
                From the Define
                    panel, click Add under the Curve list.
                - For Complex Plot and Polar Plot, click Add P/M to add a Phase/Magnitude curve or Add R/I to add a Real/Imaginary Curve.
 A curve labeled "Curve 1" is appended to the list.
- Enter a name for the untitled curve in the text field above the list.
- 
                Click Enter.
                The new name is now displayed in the list and in the legend.This process adds a new blank curve to the active window.