NATURAL CUBIC SPLIINE INTERPOLATION
The numbers X(0), ..., X(N) are:
-0.10000000E+01 0.00000000E+00 0.10000000E+01 0.20000000E+01
SPLINE CONSISTS OF 3 PIECES WITH COEF. A(I),B(I),C(I),D(I)
-0.20000000E+01 0.44000001E+01 0.00000000E+00 -0.40000001E+00
0.20000000E+01 0.32000000E+01 -0.12000000E+01 0.00000000E+00
0.40000000E+01 0.80000001E+00 -0.12000000E+01 0.40000001E+00