=</span> <span class="n">np</span><span class="o">.</span><span class="n">concatenate</span><span class="p">((</span><span class="n">curr_spec</span><span class="p">,</span> <span class="n">np</span><span class="o">.</span><span class="n">conj</span><span class="p">(</span><span class="n">curr_spec</span><span class="p">[</span><span class="o">-</span><span class="mi">2</span><span class="p">:</span><span class="mi">0</span><span class="p">:</span><span class="o">-</span><span class="mi">1</span><span class