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.
Dashed lines denote instances of the same node in different snapshots. Colored lines denote what it means for D1 (blue), D2 (green), and D9 (red) to exist in a network. The figure originates from [5].
