p">,</span> <span class="n">state</span><span class="p">)</span>
    <span class="n">n</span> <span class="o">=</span> <span class="n">iDEA</span><span class="o">.</span><span class="n">observables</span><span class="o">.</span><span class="n">density</span><span class="p">(</span><span class="n">s</span><span class="p">,</span> <span class="n">state</span><span class="p">)</span>
    <span class="n">v_h</span> <span class="o">=</span> <span class="n">iDEA</span><span class="o">.</span><span class="n">obser