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.
(A) Call from one individual showing the single and double pulses preceding a burst. (B) expanded double pulse. (C) last individual pulse and the first pulse of a burst. Note the similarity in waveforms.
