span> <span class="n">spd_to_xyz</span><span class="p">(</span><span class="n">C</span><span class="p">,</span> <span class="n">cieobs</span> <span class="o">=</span> <span class="n">cieobs</span><span class="p">,</span> <span class="n">relative</span> <span class="o">=</span> <span class="kc">False</span><span class="p">)</span>
    <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="n">C</span><span class="o">.</s