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.
An example showing 30 random samples drawn from the 83 reference values shown in Figure 2. Only 30 random samples are shown here in order to be able to show the principle in a single figure/screen. The 83 reference values are shown in the column on the far left (column A) marked with a blue box.
