Line styles are specified by the following properties:
linestyle
May be one of
"-"
Solid line. [default]
"--"
Dashed line.
":"
Dotted line.
"-."
A dash-dot line.
"none"
No line. Points will still be marked using the current Marker Style.
linewidth
A number specifying the width of the line. The default is 1. A value of 2 is twice as wide as the default, etc.