 "ell_nodes.txt">ell_nodes.txt</a>
          the nodes.
        </li>
        <li>
          <a href = "ell_elements.txt">ell_elements.txt</a>
          the elements.
        </li>
        <li>
          <a href = "ell_values.txt">ell_values.txt</a>
          the values to be contoured.
        </li>
        <li>
          <a href = "ell.png">ell.png</a>
          the contour plot.
        </li>
      </ul>
    </p>

    <p>
      <b>LAKE</b> is an irregularly region meshed by 3-node triangles
      <ul>
  