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.
The radius of curvature of the aluminium base along two perpendicular directions on the base, (a) X and (b) Y. The blue symbols show the height profile in the measured area, and the red marks show the deviation of the measured radius from a sphere.
