><a href="highest_concentration.html">highest_concentration</a></code> returns the highest concentration within
a portfolio based on grid points. However, higher concentrations can be
found within two grid points. `neighborhood_gh_search()` looks for even
higher concentrations in the neighborhood of the grid points with the highest
concentrations. This optimization is done by means of Simulated Annealing.</p>
    </div>

    <div class="section level2">
    <h2 id="ref-usage">Usage<a class="anchor" aria-lab