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.
Both pulses are represented. The black triangles represent the baseline conditions, while the blue circles and the red diamonds represent reclined positions without and with submarining, respectively.
