https://help.syncfusion.com/cr/xamarin-ios/Syncfusion.XlsIO.Parser.Biff_Records.Charts.ChartChartFormatRecord.html
Class ChartChartFormatRecord - Xamarin.iOS API Reference | Syncfusion
This record is the parent record for the chart group format description. Each chart group will have a separate CHARTFORMAT record, followed by a BEGIN record,...
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