Index
Polygonal (Broken) Line
  To plot a polygon line defined by Cartesian coordinates of its vertices
select Broken Line in the Choose Curve Type window, press OK
and enter linee
definition in the following format:
(x1,y1)± (x2,y2)± (x3,y3) ± ...
where each pair of numbers specivies Cartesian coordinates of a vertex. Put '+'
between vertices to connect them with a line segment, or '-' if you want to omit
the segment.
Examples:

(0,0)+(0,1)+(1,0)+(0,0)                    defines a triangle with given vertices
(0,0)+(0,1)-(0,1)+(1,1)                    defines two parallel segments