              <span class="n">true_max</span> <span class="o">=</span> <span class="n">values</span><span class="o">.</span><span class="n">max</span><span class="p">()</span>
                <span class="k">if</span> <span class="n">i_min</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
                    <span class="n">i_min</span> <span class="o">=</span> <span class="n">true_min</span> <span class="o">-</span> <span class="mi">3</span><span class="o">*</span><span