function [ n_data, tc, p, lambda ] = thercon_values ( n_data )

%*****************************************************************************80
%
%% thercon_values() returns some values of the thermal conductivity.
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    19 September 2004
%
%  Author:
%
%    John Burkardt
%
%  Reference:
%
%    Lester Haar, John Gallagher and George Kell,
%    NBS/NRC Steam Tables:
%    Thermodynamic and Transport Properties and Computer Programs
%      for Vapor and Liquid States of Water in SI Units,
%    Hemisphere Publishing Corporation, Washington, 1984,
%    TJ270.H3, page 264.
%
%  Input:
%
%    integer N_DATA.  The user sets N_DATA to 0 before the first call.  
%    Thereafter, it should simply be the value returned by the previous call.
%
%  Output:
%
%    integer N_DATA.  On each call, the routine increments N_DATA by 1, and
%    returns the corresponding data; when there is no more data, the
%    output value of N_DATA will be 0 again.
%
%    real TC, the temperature, in degrees Celsius.
%
%    real P, the pressure, in bar.
%
%    real LAMBDA, the thermal conductivity, in
%    mW/(m degrees Kelvin).
%
  n_max = 35;

  lambda_vec = [ ...
     561.00E+00, ...
     561.30E+00, ...
     561.50E+00, ...
     562.40E+00, ...
     563.70E+00, ...
     565.10E+00, ...
     566.50E+00, ...
     567.90E+00, ...
     569.30E+00, ...
     570.60E+00, ...
     572.00E+00, ...
     573.40E+00, ...
     574.80E+00, ...
     576.10E+00, ...
     577.50E+00, ...
     580.20E+00, ...
     582.90E+00, ...
     585.50E+00, ...
     588.10E+00, ...
     590.70E+00, ...
     593.30E+00, ...
     595.80E+00, ...
     598.30E+00, ...
     603.10E+00, ...
     607.80E+00, ...
     612.20E+00, ...
     607.20E+00, ...
     643.60E+00, ...
     666.80E+00, ...
      25.08E+00, ...
      28.85E+00, ...
      33.28E+00, ...
      54.76E+00, ...
      79.89E+00, ...
     107.30E+00 ];

  p_vec = [ ...
        1.0E+00, ...
        5.0E+00, ...
       10.0E+00, ...
       25.0E+00, ...
       50.0E+00, ...
       75.0E+00, ...
      100.0E+00, ...
      125.0E+00, ...
      150.0E+00, ...
      175.0E+00, ...
      200.0E+00, ...
      225.0E+00, ...
      250.0E+00, ...
      275.0E+00, ...
      300.0E+00, ...
      350.0E+00, ...
      400.0E+00, ...
      450.0E+00, ...
      500.0E+00, ...
      550.0E+00, ...
      600.0E+00, ...
      650.0E+00, ...
      700.0E+00, ...
      800.0E+00, ...
      900.0E+00, ...
     1000.0E+00, ...
        1.0E+00, ...
        1.0E+00, ...
        1.0E+00, ...
        1.0E+00, ...
        1.0E+00, ...
        1.0E+00, ...
        1.0E+00, ...
        1.0E+00, ...
        1.0E+00 ];

  tc_vec = [ ...
       0.0E+00, ...
       0.0E+00, ...
       0.0E+00, ...
       0.0E+00, ...
       0.0E+00, ...
       0.0E+00, ...
       0.0E+00, ...
       0.0E+00, ...
       0.0E+00, ...
       0.0E+00, ...
       0.0E+00, ...
       0.0E+00, ...
       0.0E+00, ...
       0.0E+00, ...
       0.0E+00, ...
       0.0E+00, ...
       0.0E+00, ...
       0.0E+00, ...
       0.0E+00, ...
       0.0E+00, ...
       0.0E+00, ...
       0.0E+00, ...
       0.0E+00, ...
       0.0E+00, ...
       0.0E+00, ...
       0.0E+00, ...
      25.0E+00, ...
      50.0E+00, ...
      75.0E+00, ...
     100.0E+00, ...
     150.0E+00, ...
     200.0E+00, ...
     400.0E+00, ...
     600.0E+00, ...
     800.0E+00 ];

  if ( n_data < 0 )
    n_data = 0;
  end

  n_data = n_data + 1;

  if ( n_max < n_data )
    n_data = 0;
    tc = 0.0;
    p = 0.0;
    lambda = 0.0;
  else
    tc = tc_vec(n_data);
    p = p_vec(n_data);
    lambda = lambda_vec(n_data);
  end

  return
end
