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DEM52

       SUBROUTINE  DEM52 (NIN,NOUT)
 C$    (DEM52 - Irregular Grid Surface Fit)
 C$    This program  is  a  test  program  for  the  FITVBV/FITVSF
 C$    subprogram package.   All elements  of resulting  DZI1  and
 C$    DZI2 arrays are expected to be zero.  The fitting  routines
 C$    have been developed and described by:
 C$
 C$    Hiroshi Akima, "A  Method for  Bivariate Interpolation  and
 C$    Smooth Surface  Fitting  for Irregularly  Distributed  Data
 C$    Points", ACM Trans. Math. Software 4, No. 2, 148-159  (June
 C$    1978).
 C$
 C$    Hiroshi Akima, "Algorithm 526: Bivariate Interpolation  and
 C$    Smooth Surface  Fitting  for Irregularly  Distributed  Data
 C$    Points (E1)", ACM Trans. Math.  Software 4, No. 2,  160-164
 C$    (June 1978).
 C$
 C$    Hiroshi Akima, "Remark on Algorithm 526", ACM Trans.  Math.
 C$    Software 5, No. 2, 242-243 (June 1979).
 C$
 C$    Albrecht Preusser, "Remark  on Algorithm  526", ACM  Trans.
 C$    Math.  Software 11, No. 2, 187-187 (June 1985).
 C$    (21-AUG-85)