An official website of the United States government
Here's how you know
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.
Angular average (log scales) (a) of the intensities of Fig. 9 ▶ over a 5 pixels ring and the corresponding estimated coherence (b). Pixel units are distances to the central peak in Fig. 9 ▶, i.e. Å−1 per pixel.