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.
The highlighted borders show the boundaries drawn using a computer-aided manual segmentation technique. Thicknesses between two boundaries can then be measured. The OS+ thickness (yellow vertical line), REC+ thickness (blue vertical line), and INL thickness (green vertical line) were measured
