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    <ul style="font-family: monospace;">
      <li><a href="kraken.htm">KRAKEN</a>&nbsp;&nbsp;&nbsp; Solves for
        the modes and writes them to disk. Elastic media are allowed but
        material attenuation in an elastic medium is ignored.</li>
      <li>KRAKENC&nbsp;&nbsp; A version of KRAKEN which finds the
        eigenvalues in the complex plane.&nbsp; KRAKEN uses perturbation
        theory to obtain imaginary parts of the eigenvalues while
        KRAKENC computes the complex eigenvalues