| Ratio | Graphics.Gnuplot.Simple |
| red | Graphics.Gnuplot.ColorSpecification |
| remove | Graphics.Gnuplot.Frame.OptionSet |
| rgb | Graphics.Gnuplot.ColorSpecification |
| rgb8 | Graphics.Gnuplot.ColorSpecification |
| rowstacked | Graphics.Gnuplot.Frame.OptionSet.Histogram |
| royalblue | Graphics.Gnuplot.ColorSpecification |