interpolting (spline)

Hi,

Does anyone know how I can do an interpolation (with spline) using awk or any other way?

This is part of the sample:

1  1.36064
1.09999  1.44
1.20005  1.84
1.30005  2.0416
1.39997  2.24
1.49993  2.4416
1.6  2.6592
1.7001  2.88
1.79986  3.1392
1.90006  3.36

Thanks!

if you have an easily defined formulae for the spline interpolation, please do share.
If you a reference that can be easily digested, please share as well.
One of the refs that Google found was this, but my head started hurtin'....