    If some GPX files contains timestamps, it is ensured that the timestamps of the merged file are strictly increasing (the timestamps of some files are shifted if necessary).
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                <div class="guide-item"><a name="extract-segments" href="#extract-segments" class="my-anchor"><div class="guide-title" onclick="toggle('extract')">Extract tracks or tracks segments of a GPX file</div></a>
                <div id="extract" class="guide-content">
                    To extra