</span><span class="o">.</span><span class="n">hue_angle</span><span class="p">(</span><span class="n">at</span><span class="p">,</span><span class="n">bt</span><span class="p">,</span><span class="n">htype</span> <span class="o">=</span> <span class="s1">&#39;rad&#39;</span><span class="p">)</span>
            
            <span class="n">dJ</span> <span class="o">=</span> <span class="n">Jt</span> <span class="o">-</span> <span class="n">Jr</span>
            <span class="n">dC</span> <span class="o">=</s