image.</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">selected_spectrum</span> <span class="o">=</span> <span class="n">cell_layer</span><span class="p">[</span><span class="mi">20</span><span class="p">,</span> <span class="mi">30</span><span class="p">]</span>
</pre></div>
</div>
<p>We will first preprocess the spectral spectrum</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">preprocessing_pipe