span class="mi">1</span><span class="o">/</span><span class="p">(</span><span class="n">std</span><span class="o">*</span><span class="n">math</span><span class="o">.</span><span class="n">sqrt</span><span class="p">(</span><span class="mi">2</span><span class="o">*</span><span class="n">math</span><span class="o">.</span><span class="n">pi</span><span class="p">))</span>

        <span class="n">dx</span> <span class="o">=</span> <span class="p">(</span><span class="n">maximum</span> <span class="o">-</spa