SPLINE

Draws a quadratic or cubic spline (nonuniform rational B-spline) curve.

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Specify:

1 First point
2 Next point (loops so that you can specify as many points as you want)
3 Complete the spline by one of the following methods:

a Close (to close the spline)
b Tangent

- or -

a Enter (to end the spline without closing it)
b Start tangent
c End tangent

The spline is a single entity.