Left: $\pt$-differential production cross sections of prompt  and non-prompt $\Dzero$, $\Dplus$, and $\Ds$ mesons at midrapidity, $|y|<0.5$, in pp collisions at $\s=13$ TeV. Right: ratios between the production cross sections of non-prompt and prompt $\Dzero$ (top), $\Dplus$ (middle), and $\Ds$ (bottom) mesons at $\s = 5.02$  and $13$ TeV. The vertical bars and empty boxes represent the statistical and systematic uncertainties, respectively.