s</span><span class="p">(</span><span class="n">mu</span><span class="p">[</span><span class="n">i</span><span class="p">,</span><span class="mi">1</span><span class="p">]</span><span class="o">/</span><span class="n">mu</span><span class="p">[</span><span class="n">i</span><span class="p">,</span><span class="mi">0</span><span class="p">]))</span>
            <span class="k">if</span> <span class="n">image_type</span><span class="p">[</span><span class="n">i</span><span class="p">,</span><span class="mi">0