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Specifies the possible line ending styles.
Butt: 6;
A short line at the endpoint perpendicular to the line itself.
Circle: 2;
A circle filled with the annotation's interior color, if any.
ClosedArrow: 5;
Two short lines meeting in an acute angle as in the OpenArrow style and connected by a third line to form a triangular closed arrowhead filled with the annotation's interior color, if any.
Diamond: 3;
A diamond shape filled with the annotation's interior color, if any.
None: 0;
No line ending.
OpenArrow: 4;
Two short lines meeting in an acute angle to form an open arrowhead.
RClosedArrow: 8;
A triangular closed arrowhead in the reverse direction from ClosedArrow.
ROpenArrow: 7;
Two short lines in the reverse direction from OpenArrow.
Slash: 9;
A short line at the endpoint approximately 30 degrees clockwise from perpendicular to the line itself
Square: 1;
A square filled with the annotation's interior color, if any.