Figure 15.
Amplitude of movement at low (0.1 Hz) and high (1.1 Hz and 1.4 Hz) frequencies.
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.