Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
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A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Regional correlation between hook length and elevation (regression: r2=0.075, F=23.32, d.f.=11, p=0.001, n=154). Dots represent individuals. Significance was assessed using robust variance to control for correlations within sites (see text).
