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.
Relationship between ozone uptake and stomatal conductance in leaves of holm oak (black symbols) and P. nigra (white symbols). The second-order best-fit lines (r2 = 0.84 and 0.96, respectively) were generated by the Sigmaplot 2002 software (Systat) and are not constrained through the origin.
