ExcelChart.ChartOptions Property
Returns the type of chart and the options specific for that kind of chart. There might be more than one ChartOptions returned, since you can mix more than one type of chart on a simple chart. (One for each series). You need to look at the series ChartOptionsIndex to know to which one it refers.
Syntax
Namespace: FlexCel.Core
public abstract TChartOptions[] ChartOptions { get; }