English: Simple interpolation example with polyharmonic splines where the polynomial term of the spline is not taken into account. The figure demonstrates that the extrapolation for x < 0 is no longer as "natural" as with the polynomial term for some of the basis functions. This indicates, that the polynomial term is useful if extrapolation occurs.
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{{Information |Description={{en|1=Simple interpolation example with polyharmonic splines where the polynomial term of the spline is not taken into account. The figure demonstrates that the extrapolation for x < 0 is no longer as "natural" as with the poly