     and seems to show periodicity, except that it is clearly growing.
      <ul>
        <li>
          <a href = "trf_1000.txt">trf_1000.txt</a>,
          a table of the prey and predator values using 1000 steps.
        </li>
        <li>
          <a href = "trf_1000.png">trf_1000.png</a>,
          a plot.
        </li>
      </ul>
    </p>

    <p>
      <b>TRF_10000</b> uses 10000 timesteps.  The cyclic nature of
      the solution is clear.
      <ul>
        <li>
          <a href = "trf_10000.txt