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Curve – The Bezier curve which can be manipulated by adding/removing points, using the / buttons respectively.

Num Bezier Points for Curve – Specifies the number of precisely calculated points from the Bezier curve.

Extrapolate Beyond End Points for Curve – When enabled, it extrapolates the value beyond the control points.

Extrapolate Type for Curve – Specifies the type of extrapolation for points out of the control range.

End Tangent – The curve is not extrapolated beyond the end tangent.
Linear – The curve continues to increase/decrease in a linear fashion beyond the control points, depending on its behavior beforehand. For instance, if the curve was going up, then it will continue to go up and vice versa. This extrapolation type is useful for linear graphs.
Constant – The curve continues beyond the control points at the same level as the last point of the curve. For instance, if the last point is set at the top of the graph, then any point after that will also be at the top.

Clamp – Determines whether to force the result into the [0..1] clamping range.

Clamp Min Value – Specifies the lower clamp limit if Clamp is enabled.

Clamp Max Value – Specifies the upper clamp limit if Clamp is enabled.

CPU Curve Mode – Specifies the GPU curve mode. You can chose between Intensity, Red, Green, Blue, Alpha.