- If this property is not set, then bubbles will have their default size of 0 and will not be visible.
- You will need to set this property in order for a new bubble series to have visible bubbles.
* The range of cells referenced by this property should contain the values to use for the bubbles sizes. For example, if it points to the range A1:A4, then the first four bubbles in the series will have a size corresponding to the values in those four cells. - Returns null if the chart is not a bubble chart.
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