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"Index" - This is the label assigned to the spline. In general, it's simplest just to label them A, B, C etc.

"Order" - This determines the number of Control Points on the spline. For example, selecting '3' means there will be 3 points on the spline that can be moved, as well as 3 points off the spline that will control the slope.

"Initial x-value" and "Initial y-value" - These values determine where the left most Control Point will be.

"Scale x" - This determines the right most location of the Control Points (on the spline). To figure out where this point will be, add 'Initial x-value' to 'Scale x'.

"Scale y" - This determines the distance (in the y-direction) between the Control Points on the spline, and the ones that control the slope.