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.
Two spheres with radius R and 2R and the depths d and 2d are shown respectively. The normalized depths d N = (d/R) = (2d/2R) compensate the depth (size) differences in two structures with similar morphology. [Color figure can be viewed in the online issue, which is available at wileyonlinelibrary.com.]
