"p">[</span><span class="s1">&#39;df&#39;</span><span class="p">][</span><span class="s1">&#39;valley&#39;</span><span class="p">]</span><span class="o">.</span><span class="n">sum</span><span class="p">())</span>
<span class="c1"># 23</span>
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<p>The output is a dictionary containing a single dataframe (<em>df</em>) that can be of use for follow-up analysis.</p>
</section>
<section id="references-caerus">
<h2>References Caerus<a class="headerlink" href="#references-caerus" title="Link to 