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.
Marginal frequency histograms (filled bars, left ordinates) and cumulative distributions (solid curves, right ordinates) of number of people by elevation (a); occupied land area by elevation (b); number of people by population density (c); and occupied land area by population density (d). Derived from Fig. 1.
