                    <div>
                        <h4>Return Value</h4>
                        <p>A [Single] emitting a list of [Polar247PPiSamplesData] representing the 24/7 PPi data for the specified period.</p>
                      </div>
                    </section>
                  </div>
                </li>
                <li class="item">
                  <div>
                    <code>
                    <a name="/s:11PolarBleSdk0A11ActivityApiP03getD10SampleData10identifier8fromDate02toK