| magenta | Graphics.Gnuplot.ColorSpecification |
| Mean | Graphics.Gnuplot.Simple |
| Median | Graphics.Gnuplot.Simple |
| mediumBlue | Graphics.Gnuplot.ColorSpecification |
| mesh | Graphics.Gnuplot.Plot.ThreeDimensional |
| midnightBlue | Graphics.Gnuplot.ColorSpecification |
| monochrome | Graphics.Gnuplot.Terminal.PostScript |