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.
The network was constructed using a median-joining algorithm as implemented in the Network 4.6.0 program. The size of the circles is proportional to the number of samples.
