Reference a Curve in the Active Window

1. Place the cursor in one of the vector text fields.
2. Hold down the Shift key and pick a curve.
   The corresponding vector from the picked curve is inserted into the expression. If the cursor is in the X vector text field, the X vector of the picked curve is inserted.

Or

3. Hold down the Shift and Control keys and pick a curve. The opposite vector from the selected curve is inserted into the expression. If the cursor is in the Y vector text field, the X vector of the selected curve is inserted.

Or

4. Type the curve reference directly into the text box using reference notation described above.

Or

5. Select a curve using the Curves dialog.