

   WWaavveeffoorrmm DDiissttoorrttiioonn DDaattaa ffoorr BBiivvaarriiaattee IInntteerrppoollaattiioonn

   AArrgguummeennttss::

      x,y,z: represents a smooth surface of `z' values at
             selected points irregularly distributed in the `x-
             y' plane.

   SSOOUURRCCEE::

        Hiroshi Akima, "A Method of Bivariate Interpolation and
        Smooth Surface Fitting for Irregularly Distributed Data
        Points", ACM Transactions on Mathematical Software,
        Vol. 4, No. 2, June 1978, pp. 148-159.  Copyright 1978,
        Association for Computing Machinery, Inc., reprinted by
        permission.

        The data was taken from a study of waveform distortion
        in electronic circuits, described in: Hiroshi Akima, "A
        Method of Bivariate Interpolation and Smooth Surface
        Fitting Based on Local Procedures", CACM, Vol. 17, No.
        1, January 1974, pp. 18-20.

