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.
Wear curves of each design type (rotating platform versus fixed bearing) were averaged together and compared. The equations shown are the least square error regression lines with a free intercept (not forced through 0). The 95% confidence limits at each stage are shown as error bars and clearly overlap each other.
