n class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">noisy_signals</span><span class="p">[</span><span class="n">background_idx</span><span class="p">])</span>
<span class="n">ax0</span><span class="o">.</span><span class="n">set_ylabel</span><span class="p">(</span><span class="s2">&quot;Amplitude&quot;</span><span class="p">)</span>
<span class="n">ax0</span><span class="o">.</span><span class="n">set_xlabel</span><span class="p">(</span><span class="s2">&quot;Time step&q