Top: ratios of \ptchjet-differential cross section of charm jets tagged with \Dzero mesons in \pp collisions at \thirteen to \five for $R=0.2$ (left), $R=0.4$ (centre), and $R=0.6$ (right) compared to PYTHIA 8 HardQCD Monash 2013 (dash-dotted lines), PYTHIA 8 SoftQCD Mode 2 (dashed lines), and POWHEG hvq + PYTHIA 8 (open circles) predictions. The shaded bands indicate the systematic uncertainty on the cross section ratios while open boxes represent the theoretical uncertainties on the POWHEG predictions. Bottom: ratios of MC predictions to the data