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Excel enumerated type for arrowhead styles.
public enum LineArrowHeadStyles
  Used with DDSheet.AddLine(..).
| Name | Description | 
|---|---|
| DoubleEndedFilled | Double ended filled  | 
      
| DoubleEndedOpen | Double ended open  | 
      
| Filled | Filled  | 
      
| None | None  | 
      
| Open | Open  |