Fig 2. The probability of links as function of distance.
Probability P(d) is plotted as function of distance on a log-log scale. The straight line depicts a power-law d -0.6.
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.