   <span class="c">!</span>
    <span class="c">!  Licensing:</span>
    <span class="c">!</span>
    <span class="c">!    This code is distributed under the GNU LGPL license.</span>
    <span class="c">!</span>
    <span class="c">!  Modified:</span>
    <span class="c">!</span>
    <span class="c">!    10 September 2009</span>
    <span class="c">!</span>
    <span class="c">!  Author:</span>
    <span class="c">!</span>
    <span class="c">!    John Burkardt</span>
    <span class="c">!</span>
    <span 