So, I started over and downloaded my matches for 4th cousins or closer. After creating a new file and again making sure the 'skip' information was included, I still had a blob -- just less dense.
Experiment #1: Isolating CRAWFORD line
- Sort Vertices by shared CM from largest to smallest
- Using data in 'notes', enter 'skip' in visibility field for known matches to other lines thru 150 matches
- Save file different name
- Refresh graph
Group by Cluster
Since my experimentation (playing around) didn't produce a graph anything close to the example, I'm going to give up for now and wait for the next blog post of suggestions.