Information section Uncertainty Analysis for full details), and the obtained reactivity ratio values (rendo-NB = 0.4 and riPrSi8 = 0.08) are statistically significantly different than those we reported previously (i.e., rendo-NB = 0.61 and riPrSi8 = 0.72). We note that the fit value of 𝛾 for this monomer pair is statistically significantly different than the equilibrium concentration measured for iPrSi8.