i">3</span><span class="o">*</span><span class="n">std</span>
                    <span class="n">prop_grid</span><span class="p">[</span><span class="s2">&quot;max&quot;</span><span class="p">]</span> <span class="o">=</span> <span class="n">i_max</span>
                <span class="k">if</span> <span class="n">i_min</span> <span class="o">&gt;=</span> <span class="n">i_max</span><span class="p">:</span>
                    <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</s