Comment 8 for bug 1235504

> I believe that two arcs of 180 degrees each would be sufficient here.
According to Tavmjong Bah this is okay:
> The group decided that there should be four markers on circles and ellipses, located at the 0, 90, 180, and 270 degree points. Inkscape currently represents circles and arcs as two path elliptical arc segments. In order to have four markers, it should be using four elliptical arc segments.