Fig. 3.
Subtraction images for (A) Scenario 1, (B) Scenario 2, (C) Scenario 3, (D) Scenario 4, and (E) Scenario 5.
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.