/usr/share/doc/spline/README is in spline 1.2-1.
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1 2 3 4 5 | Akima spline interpolation
aspline(1) interpolates an Akima-spline trough a series of given points.
The Akima-spline interpolation approximates a manually drawn curve better
than the ordinary splines, but the second derivation is not continuous.
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