function u = trinity_node_xy_tabulated ( )

%*****************************************************************************80
%
%% trinity_node_xy_tabulated returns the nodes of the trinity grid.
%
%  Discussion:
%
%    I determined these node coordinates by generating the nodes of a
%    rectangular grid, plotting those nodes and the boundary of the
%    trinity grid, and deleting the prodigal points.
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    08 January 2021
%
%  Author:
%
%    John Burkardt
%
%  Output:
%
%    real U(88,2): the (x,y) coordinates of the nodes.
%
  u = [ ...
    0.0000,   0.0000; ...
    0.0000,   0.5774; ...
    0.0000,   0.8660; ...
    0.0000,   1.7321; ...
%
    0.2500,   0.4330; ...
    0.2500,   1.2990; ...
    0.2500,   2.1651; ...
%
    0.5000,   0.0000; ...
    0.5000,   0.2887; ...
    0.5000,   0.8660; ...
    0.5000,   1.4434; ...
    0.5000,   1.7321; ...
    0.5000,   2.0207; ...
    0.5000,   2.5981; ...
%
    0.7500,   0.4330; ...
    0.7500,   1.2990; ...
    0.7500,   2.1651; ...
%
    1.0000,   0.0000; ...
    1.0000,   0.5774; ...
    1.0000,   0.8660; ...
    1.0000,   1.1547; ...
    1.0000,   1.7321; ...
    1.0000,   2.3094; ...
    1.0000,   2.5981; ...
%
    1.2500,   0.4330; ...
    1.2500,   1.2990; ...
    1.2500,   2.1651; ...
%
    1.5000,   0.0000; ...
    1.5000,   0.2887; ...
    1.5000,   0.8660; ...
    1.5000,   1.4434; ...
    1.5000,   1.7321; ...
    1.5000,   2.0207; ...
    1.5000,   2.5981; ...
%
    1.7500,   0.4330; ...
    1.7500,   1.2990; ...
    1.7500,   2.1651; ...
%
    2.0000,   0.0000; ...
    2.0000,   0.5774; ...
    2.0000,   0.8660; ...
    2.0000,   1.1547; ...
    2.0000,   1.7321; ...
    2.0000,   2.3094; ...
    2.0000,   2.5981; ...
%
    2.2500,   0.4330; ...
    2.2500,   1.2990; ...
    2.2500,   2.1651; ...
%
    2.5000,   0.0000; ...
    2.5000,   0.2887; ...
    2.5000,   0.8660; ...
    2.5000,   1.4434; ...
    2.5000,   1.7321; ...
    2.5000,   2.0207; ...
    2.5000,   2.5981; ...
%
    2.7500,   0.4330; ...
    2.7500,   1.2990; ...
    2.7500,   2.1651; ...
    2.7500,   3.0311; ...
%
    3.0000,   0.0000; ...
    3.0000,   0.5774; ...
    3.0000,   0.8660; ...
    3.0000,   1.1547; ...
    3.0000,   1.7321; ...
    3.0000,   2.3094; ...
    3.0000,   2.5981; ...
    3.0000,   2.8868; ...
    3.0000,   3.4641; ...
%
    3.2500,   0.4330; ...
    3.2500,   1.2990; ...
    3.2500,   2.1651; ...
    3.2500,   3.0311; ...
%
    3.5000,   0.2887; ...
    3.5000,   0.8660; ...
    3.5000,   1.4434; ...
    3.5000,   1.7321; ...
    3.5000,   2.0207; ...
    3.5000,   2.5981; ...
%
    3.7500,   0.4330; ...
    3.7500,   1.2990; ...
    3.7500,   2.1651; ...
%
    4.0000,   0.0000; ...
    4.0000,   0.5774; ...
    4.0000,   0.8660; ...
    4.0000,   1.1547; ...
    4.0000,   1.7321; ...
%
    4.2500,   0.4330; ...
    4.2500,   1.2990; ...
%
    4.5000,   0.8660  ...
  ];

  return
end

