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@yueming,
You can increase/decrease the number of dataPoints within the axis range as per your requirements and it should work fine. var range = Math.round(e.axisX[0].viewportMaximum - e.axisX[0].viewportMinimum);
var range = Math.round(e.axisX[0].viewportMaximum - e.axisX[0].viewportMinimum);
___ Suyash Singh Team CanvasJS