pan><span class="s1">&#39;b_pos&#39;</span><span
                                        class="p">:</span><span class="mi">0</span><span class="p">,</span><span
                                        class="s1">&#39;e_pos&#39;</span><span class="p">:</span><span
                                        class="mi">1</span><span class="p">,</span><span
                                        class="s1">&#39;u_pos&#39;</span><span class="p">:</span><span
                                        class="mi">2</s