Figure 1.
A schematic illustration of a static network of 2 communities. Solid circles and open circles represent individuals in different communities. Within each community, the location of circles does not represent their geographical locations.
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.