Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
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A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Time discrepancy between the white dot's (target) actual and the subjects' registered arrival times. The filled circle represents the dot's disappearance behind the occlusion bar, the filled squares represents the dot's reappearance from behind the occlusion bar.
