Michael Allan’s files

 Name                           Size  
 Parent Directory                 -   
 rangingLegend.png              7.2K  
 ranging3.png                    55K  
 ranging1.png                    22K  
 ranging.svg                     72K  
 extension.svg                  1.5K

Crossforum ranging. See

http://reluk.ca/w/User:Mike-ZeleaCom/Crossforum_ranging
Crossforum extension as a resource
Rule of social extension (divergence over convergence)

*.png
    - exported at 100 DPI