> <span class="n">separate</span> <span class="o">==</span> <span class="kc">True</span><span class="p">:</span>
            <span class="k">return</span> <span class="n">v_xc</span><span class="p">,</span> <span class="n">v_x</span><span class="p">,</span> <span class="n">v_c</span>
        <span class="k">else</span><span class="p">:</span>
            <span class="k">return</span> <span class="n">v_xc</span>

    <span class="k">elif</span> <span class="nb">len</span><span class="p">(</span><span class="