bel</span><span class="p">(</span><span class="s1">&#39;Frequency (Hz)&#39;</span><span class="p">,</span> <span class="n">size</span><span class="o">=</span><span class="n">TextSize</span><span class="p">)</span>
        <span class="n">plt</span><span class="o">.</span><span class="n">grid</span><span class="p">()</span>
        <span class="n">plt</span><span class="o">.</span><span class="n">legend</span><span class="p">(</span><span class="n">loc</span><span class="o">=</span><span class="s1">&#39;uppe