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.
The boxes at 10 minutes of exposure represent a total of 18 readings for both RHs. Boxes at 20, 30 and 40 min represent twelve readings each and boxes at 50, 60 and 70 min represent six readings each.
