of piecewise data on a quadrilateral mesh.
        </li>
      </ul>
    </p>

    <h3 align = "center">
      Examples and Tests:
    </h3>

    <p>
      <b>POOL</b> is a set of node, element and value data.
      The example was run with the command <b>quad_mesh_order1_display ( 'pool' )</b>.
      <ul>
        <li>
          <a href = "pool_nodes.txt">
          pool_nodes.txt</a>, the coordinates of the nodes.
        </li>
        <li>
          <a href = "pool_elements.txt">
          pool_elements.t