T</span><span class="p">:</span> <span class="nb">float</span> <span class="o">=</span> <span class="mi">30</span><span class="p">,</span> <span class="n">nu</span><span class="p">:</span> <span class="nb">float</span> <span class="o">=</span> <span class="mf">230e9</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">float</span><span class="p">:</span>
<span class="w">    </span><span class="sd">&quot;&quot;&quot;Brightness templerature from the Planck function.</span>

<span class