Edge form
The definition of the edge shape specifies whether two points are connected by a straight or a curved line. In addition the curve can also be defined as being closed which means that a smooth join is produced between the start and end points of the curve.
Depending upon the input mode the contour has either one or two edges so producing several different combinations of types of edges.
Input mode outer contour:
Form straight

Form curved

+
Form closed curve

Input mode pairwise or center line
Form straight

Form curved

+
Form closed curve on both sides

Input mode pairwise
oder
Form one side straight - one side curved
It is also possible to define here open/closed curves, this example shows closed curves.
oder 
Created with the Personal Edition of HelpNDoc: Produce Kindle eBooks easily