Surge

Shape Sets the shape of the surge field. Choose from Ellipse & Rectangular.
Center The center of the shape.
Radius The largest radius of the selected shape.
Smoothing Smoothes the distortion from the radius to the center point
Shape Angle Rotates the current shape.
Width Adjustment Sets the horizontal scale of the current shape.
Height Adjustment Sets the vertical scale of the current shape.
Power The overall power of the effect. Animating this value can yield faux field-of-view & contra zoom effects.