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.
Open and filled shapes correspond to ϕ = 0.017 and ϕ = 0.0017, respectively. Circles and squares correspond to gK = 2.5 and gk = 1.8, respectively. Other parameters are fixed at values shown in Table 1.
