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The Spline Curve area selection mode allows you to create curved areas that use Bezier polynomials to produce a smoothly flowing curved region.
The spline curve is drawn using the left mouse button to specify the points, and the right mouse button to close the shape.
Holding down both the left and right mouse buttons allows you to reposition the spline shape.
A larger number of points will produce a smoother curve.
See Also: Area Tools