2.1.3 Substream

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The workbook stream contains substreams that specify properties and data for a chart and specify the chart sheet that constitute a file of the type specified by this document. The beginning of each substream is marked by a BOF record that has a docType field that specifies the type of the substream. The end of each substream is marked by an EOF record.

For more information, see Workbook Stream (section 2.1.7.3).