">trf_10000.txt</a>,
          a table of the prey and predator values using 10000 steps.
        </li>
        <li>
          <a href = "trf_10000.png">trf_10000.png</a>,
          a plot.
        </li>
      </ul>
    </p>

    <h3 align = "center">
      List of Routines:
    </h3>

    <p>
      <ul>
        <li>
          <b>FD_PREDATOR_PREY</b> solves a pair of predator-prey ODE's.
        </li>
        <li>
          <b>GET_UNIT</b> returns a free FORTRAN unit number.
        </li>
        <li>
     