$\pt$-differential production cross section of $\Dzero$ mesons with $|y|< 0.5$ in pp collisions at $\sqrt s =7 \tev$. Left: comparison of prompt and inclusive $\Dzero$ mesons (the latter including also $\Dzero$ mesons from beauty-hadron decays) from the analysis without decay-vertex reconstruction. Right: comparison between the prompt $\Dzero$ cross sections measured with and without decay-vertex reconstruction. Here and in all the following figures the symbols are plotted at the centre of the $\pt$ intervals (shown by the horizontal lines), the vertical lines represent the statistical uncertainties and the vertical size of the boxes corresponds to the systematic uncertainties.