) must know about this “UV_Vis” directory.
If not, you can use the <code class="docutils literal notranslate"><span class="pre">pyspecdata_register_dir</span></code> command on the command line
(see <a class="reference internal" href="../auto_api/pyspecdata.html#pyspecdata.datadir.register_directory" title="pyspecdata.datadir.register_directory"><code class="xref py py-func docutils literal notranslate"><span class="pre">register_directory()</span></code></a>).</p></li>
<li><p>The name of the file itsel