Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Shown are topologies derived from: (a) refs 6, 12 and 16; (b) ref. 17; (c) ref. 40; (d) ref. 43; and (e) ref. 15. Out stands for the outgroup, an asterisk indicates a BS value of 100%.
