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Use this option to use a reference line inside the image to that you want to have straightened (leveled).
Now drag a line over the area that you need to have straightened.Do that by clicking the start point and then, while holding down the left mouse button, drag a line to the end point.
After releasing the mouse you will get the Free Rotate dialog where you can optionally make a change. The angle in the dialog is based on the selected area.
Click <OK> to confirm the rotation.