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.
Contrast component for taking difference between two power averages, within trial. The gray values are zero, the black values are negative, and the white values are positive. The actual values are based on the total number of power values in each average.
