Figure 1.
The 2 artificial canals. Canal 1 (A), 45º angle and 5-mm radius; canal 2 (B), 60º angle and 5-mm radius.
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.