Fig 3. Hierarchical Ascendant Classification (HAC) on principal component analysis (PCA) of the studied sites.
Dim.1 and Dim. 2 are the two first dimensions issued from the PCA.
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.