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.
| Grade | Assessment | Definition |
| ++++ | Excellent image | Excellent resolution of details and excellent visibility, good demarcation from surrounding |
| +++ | Good image | Good resolution of details, demarcation from surrounding, clear visibility |
| ++ | Fair image | Insufficient resolution of details, insufficient visibility, insufficient demarcation |
| + | Bad image | Details not resolved, bad demarcation from surrounding, bad visibility |
| 0 | No image | Invisible |
