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 colours of the different regions correspond to the following χγ intervals: green: χγ < 0.7; yellow: 0.7 ≤ χγ < 0.8; orange 0.8 ≤ χγ < 0.9, and red: χγ ≥ 0.9.
