>
                  <br />
                  <li>
                    Here the label positions are computed thanks to the
                    <code>centroid()</code> function.
                  </li>
                  <br />
                  <li>
                    Note that a color scale is used for group, as explained
                    <a href="custom_color.html">here</a>.
                  </li>
                </ul>
              </div>
            </div>
          </div>

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