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.
Twinning statistics. The experimental N(Z) plots calculated from the measured data for data set 1 (blue crosses) and data set 2 (red dots). The exponential and sigmoidal black lines correspond to nontwinned and perfectly twinned theoretical instances, respectively.
