| E02BAF | Least squares curve cubic spline fit (including interpolation) |
| E02BEF | Least squares cubic spline curve fit, automatic knot placement |
| E02BFF | Evaluation of fitted cubic spline, function and optionally derivatives at a vector of points |
| G10ABF | Fit cubic smoothing spline, smoothing parameter given |
| G10ACF | Fit cubic smoothing spline, smoothing parameter estimated |