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.
Defects seen and missed by observers specified for each type of defect and imaging method. “X” indicates a defect, indicated by a grey field, seen by both observers. An empty grey field indicates that one or both observers missed the defect.
