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.
Examples of an ellipse defined on a void by the function “regionprops”: (a) a void made of uniformly white pixels, (b) a void containing isolated black spots inside, corresponding to fragments of chains. The blue circle highlights a random atom for a visual comparison with the dimensions of space narrowing.
