To create a line
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example     see also 

1    In the Graph Annotation Tools toolbar, click .

2    Place the crosshairs at the point on the graph where you want to begin the line.

3    Click and drag the crosshairs to the point where you want to end the line and release the mouse.

Tip

To draw a line along the nearest 45 degree angle, press and hold [Shift] while dragging the crosshairs.