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We achieve the tooltip syncing using updated event and showAtX method of tooltip. Whenever tooltip of any chart is updated, the updated event of tooltip for that respective chart is called and we use e.entries.xValue i.e. dataPoint x value to display tooltip at respective x value on every chart. In the example you have shared, the chart 2 there is no dataPoint between 10 and 60 because of which updated event passes x value as 10 or 60 to display other charts based on mouse movement.