These two documents are not dissociative.
They mutually complement/explain each other.
Example supplied reproduces 1/1 OriginLab 6.0.
Cheers ... Jean.

Interpolate bSpline Copy.sm (36,06 KiB) scaricato 1599 volta(e).
Interpolate Bezier Copy.sm (72,43 KiB) scaricato 1637 volta(e).