Figure 9.
Selection of the #2-AB vertical position. On the left, the positive vertical gradient image . On the right, 1D profile of the dashed column of .
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.