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SUBROUTINE DEM48 (NIN,NOUT)
C$ (DEM48 - Tensioned Spline Interpolation)
C$ This program illustrates the use of routines FITC1 and
C$ FITC2 from ACM Algorithm 476 for interpolating a curve by a
C$ spline under tension. Two examples showing a decaying sin
C$ wave and its interpolated and exact derivative are
C$ produced. For each, the original data points are drawn,
C$ connected by straight lines, with the interpolated curves
C$ for three different tension factors appearing in quadrants
C$ 2-4. The error in the interpolated function is multiplied
C$ by 100 and superimposed on each plot.
C$ (10-APR-82)