The \ipqcd\ distribution for 0--30\% \PbPb collisions (full-red square), and the measured $I_{\rm pA}$ from Ref.~ (open-black squares) as a function of \zt. The boxes and vertical lines represent the systematic and statistical uncertainties, respectively. For \PbPb collisions \ipqcd, the green-open boxes represent the $\mu$ scale uncertainty for the denominator NLO pQCD calculation for \pp collisions The results are compared with a theory estimation for $\it{I}_{\rm{AA}}$ with CNM effects only (light orange-dashed line and uncertainty band). Note the selection criteria for the \PbPb measurements and theory, and pp and \pPb collisions are different, as shown in the legend. The effects of the different selection criteria are expected to cancel in the ratio.