ConstReadonlyDash: "dash"ReadonlyDashDot: "dashDot"ReadonlyDot: "dot"ReadonlyLongDash: "lgDash"ReadonlyLongDashDot: "lgDashDot"ReadonlyLongDashDotDot: "lgDashDotDot"ReadonlySolid: "solid"ReadonlySysDash: "sysDash"Square dot.
ReadonlySysDashDot: "sysDashDot"ReadonlySysDashDotDot: "sysDashDotDot"ReadonlySysDot: "sysDot"Round dot.
The sys presets are measured in line widths of a hairline; the others in the line's own
width. IBorders.StrokeStyle is a cell border's, a different list.
The preset dashes (DrawingML
ST_PresetLineDashVal), as Excel's Dash type list offers them.