Reaction Confidence Intervals with 13C Data. The number of reactions determined at a particular confidence given different data is plotted. The range of allowable fluxes (v
) were computed for each reaction, constrained by none, one, two or three sets of 13C data. Constraints alone are seen to determine a significant number of fluxes, while using all three 13C data sets is seen to provide the most elucidated reactions for a particular confidence interval.