o adapt the timestamps of the second trace (if any)
                <div class="center-leaflet" style="text-align: left; width: max-content; max-width: 100%;">
                    <input type="radio" id="merge-keep" name="merge-time" value="merge-keep" checked><label for="merge-keep">Keep the original timestamps (as long as they come after those of the first trace)</label><br>
                    <input type="radio" id="merge-stick" name="merge-time" value="merge-stick"><label for="merge-stick">Make the sec