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z value sets the size of the bubble which is used for visualizing the difference in value between the dataPoints. The size of the bubble depends on the difference in the z value of dataPoints and has a max limit(which depends on multiple factors like minimum z value, maximum z value, etc.) on the size after which it won’t increase any further. You can control the size of the bubble by increasing or decreasing the z value as per your requirement.

Thangaraj Raman
Team CanvasJS.