ass="n">xyz</span> <span class="o">=</span> <span class="n">spd_to_xyz</span><span class="p">(</span><span class="n">STIM</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="n">STIM</span><span class="p">[</span><span class="mi">1</span><span class="p">:]</span> <span class="o">=</span> <span cl