Fig. 1.
Two examples of trials. The left rectangle (a) displays identical figures at 70-degree. The right rectangle (b) displays mirror figures at 0-degree.
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.