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.
Overlapping width (the maximum distance of any overlapping pixel in the horizontal direction), depicted by the arrow, as spacing distance decreases. Red areas represent the overlap. A No overlap between silhouettes. B Moderate overlap between silhouettes. C Maximum overlap between silhouettes.
