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The data points included in the second chart are those with values less than the specified value. The value only takes effect if the chart's. The value only takes effect if the chart's BopPopSplitType is set to Value.

This defaults to 1 when creating a new Bar of Pie or Pie of Pie series.

If UseDefaultSplitValue is set to true, the value of this is the value that would be used if UseDefaultSplitValue were false. Setting this will set UseDefaultSplitValue to false.
For series that are not Bar Of Pie or Pie of Pie series, setting this will have no effect and it will always return 0.