Defines a line which may be associated with an entity.

Color	The color of the line.
LeadTime	The amount of time in seconds which future points will be displayed.
Show	Indicates if the line should be displayed.
Style	The style of the line.
TrailTime	The amount of time in seconds which past points will continue to be displayed.
UseLeadTrail	Indicates if lead and trail times should be used.
Width	The width of the line.