pan> <span class="n">datab</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="c1"># use wlr of background data</span>
    <span class="n">datar</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">vstack</span><span class="p">((</span><span class="n">wlr</span><span class="p">,</span><span class="n">np</span><span class="o">.</span><span class="n">ones</span><span class="p">((</span><span class="n">Lb</span><span class="o"