lectromagnetic propagation</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">s</span></code> seismic wave propagation</p></li>
</ul>
</div></blockquote>
</li>
<li><p><code class="docutils literal notranslate"><span class="pre">-a</span></code> (optional)</p>
<blockquote>
<div><p>Flag to append/recompute the coefficients to the permittivity and
stiffness matrices; Default is False. Do not
recompute if you have made manual changes to the matrices in the prj file.</p>
</div></blockqu