turn</span> <span class="n">intensity_data</span> <span class="o">@</span> <span class="n">np</span><span class="o">.</span><span class="n">linalg</span><span class="o">.</span><span class="n">inv</span><span class="p">(</span><span class="n">I</span> <span class="o">+</span> <span class="n">lam</span> <span class="o">*</span> <span class="n">D</span><span class="o">.</span><span class="n">T</span> <span class="o">@</span> <span class="n">D</span><span class="p">)</span><span class="o">.</span><span class="