Bias was incorporated as a component under the radical in the estimate of measurement uncertainty, expanding the coverage interval \cite{Magnusson2008,Phillips1997}. The combined standard uncertainty was expanded to the 95% coverage interval (\(U=2u_{\text{combined}}\)). Figure \ref{331053} shows the mean individual uncertainty component’s percent contribution to the combined standard uncertainty.  \(u_{combined}=\sqrt{u^2_{precision}+u^2_{bias}+u^2_{reference}}\)