15.4.2 Line Styles
Line styles are specified by the following properties:
- May be one of
- Solid line. [default]
- Dashed line.
- Dotted line.
- A dash-dot line.
- No line. Points will still be marked using the current Marker Style.
- A number specifying the width of the line. The default is 1. A value
of 2 is twice as wide as the default, etc.