Index - O
| OK | Chart.Parse |
| one | Chart.Data, Chart |
| opac | Data.Colour, Chart |
| opac' | Data.Colour, Chart |
| optional | Chart.Parse |
| Orientation | Chart.Primitive, Chart |
| Origin | Data.Path.Parser, Chart |
| OriginAbsolute | Data.Path.Parser, Chart |
| OriginRelative | Data.Path.Parser, Chart |
| outerGap | Chart.Bar, Chart |
| outerPad | Chart.Hud, Chart |
| overhang | Chart.Hud, Chart |