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.
Tag distortion and its influence on the intraobserver error. A magnification of tags shows an ambiguity in point correspondence between ED (left) and ES (right) images. For the cross and circle at ED, there are two possible corresponding points at ES.
