ased on inverse distance weighting.
    </p>

    <p>
      <a href = "../../f77_src/spline/spline.html">
      SPLINE</a>,
      a FORTRAN77 library which
      constructs and evaluates spline interpolants and approximants.
    </p>

    <p>
      <a href = "../../f77_src/test_interp_1d/test_interp_1d.html">
      TEST_INTERP_1D</a>,
      a FORTRAN77 library which
      defines test problems for interpolation of data y(x),
      depending on a 2D argument.
    </p>

    <p>
      <a href = "../../f77_src/