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This is a Primitive Type plugin that is attached to a null.
It contains and manages a spline that can be edited using Spline Edit (Layout Tool) - Basic Use.
Currently only shows the number of knots in the spline.
If enabled, the spline will use the defaults defined in the Spline Preferences to display and evaluate the spline. You can use custom values for this spline by disabling this option and changing the following values.