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.
LH, RH, F, BH, LH&RF, RH&LF indicate left hand, right hand, feet, both hands, left hand combined with right foot, right hand combined with left foot respectively. Horizontal axis represents all 21 selected channels.
