Border Lines/ Discussion

This seems like a similar idea to Sector Lines. Maybe these two can be combined? Or is there a difference I'm missing?

Bildstein: There's a difference. See the first diagram of Reification, for an example of what is not a border line.

Jared: For Bill: I see the border line marked with a as a sector line between the marked white stones. (same sector line between marked black stones) Perhaps the a line is not the exact sector line between these pairs of stones, but I think on a large scale like this, it doesn't matter much.

Bill: I just looked at the history for the parent page. Is this your term, Jared? I like it. :-) However, what is indicated in the diagram as a border line is decidedly not a sector line.