9;polar&#39;</span><span class="p">)</span> <span class="o">&amp;</span> <span class="p">(</span><span class="n">plot_bin_colors</span> <span class="o">==</span> <span class="kc">True</span><span class="p">)</span> <span class="o">&amp;</span> <span class="p">(</span><span class="n">_CVG_BG</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">):</span>
            <span class="n">cvg_background</span> <span class="o">=</span> <span class="n">imread</span><span class="p">(</span><spa