Precision of each test. The mean column represents the systematic error each test contributes to the difference between testing results (across different testing types), when considered with the ordering of Equations \ref{eq:prec_min_1} to \ref{eq:prec_min_6}, the order is important as it distinguishes the sign. The 95% confidence intervals are calculated from the varance of the difference distributions giving the bounds on a given measurment, i.e. how repetable the measurement is.