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.
Power (dB) relative to frequency (Hz) for difference waves in relation to age. The plot shows three lines for each age corresponding to dummy waves and two kinds of mismatch wave, but these are not differentiated by symbols, as they are virtually superimposed.
