Top: ratios of \ptchjet-differential cross section of charm jets tagged with \Dzero mesons for different $R$: $\sigma(R=0.2)/\sigma(R=0.4)$ (circles, shifted up by 0.5) and $\sigma(R=0.2)/\sigma(R=0.6)$ (squares) in \pp collisions at \thirteen (left) and \five (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 for \mbox{$\sigma(R=0.2)/\sigma(R=0.4)$} and \mbox{$\sigma(R=0.2)/\sigma(R=0.6)$}, respectively