      <li>
          <a href = "lake_nodes.txt">lake_nodes.txt</a>
          the nodes.
        </li>
        <li>
          <a href = "lake_elements.txt">lake_elements.txt</a>
          the elements.
        </li>
        <li>
          <a href = "lake_values.txt">lake_values.txt</a>
          the values to be contoured.
        </li>
        <li>
          <a href = "lake.png">lake.png</a>
          the contour plot.
        </li>
      </ul>
    </p>

    <p>
      <b>SQUARE</b> is a square region meshed