Element: linestyle.absang[ ]
Element: linestyle.absang[ ]numeric
Whether or not angles within linestyle are absolute or relative. This is an array of size linestyle.num_segments. There is an absang value for every segment, although those for segments other than markers and text are not used.
1 - Absolute. The angle is measured counterclockwise from 0, the horizontal.
0 - Relative. The angle is measured counterclockwise from the line direction.
If not defined, relative (0) is assumed.