ref="../understanding.html">3. Understanding</a></li>
<li class="toctree-l1 current has-children"><a class="reference internal" href="fits.html">4. Fits</a><input checked="" class="toctree-checkbox" id="toctree-checkbox-1" name="toctree-checkbox-1" role="switch" type="checkbox"/><label for="toctree-checkbox-1"><div class="visually-hidden">Toggle navigation of 4. Fits</div><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></label><ul class="current">
<li class="toctree-l2"><a class="reference