Figure 3

Examples of raw-yield distribution as a function of the BDT-based selection employed in the $\chi^2$-minimisation procedure adopted for the determination of $\fnonprompt$ of $\Dzero$ mesons (top left panel), $\Dplus$ mesons (top right panel), and $\Ds$ mesons (bottom left panel) for three different $\pt$ intervals. Bottom right panel, $\fnonprompt$ fraction as a function of $\pt$ obtained for the set of selection criteria adopted in the analysis of non-prompt D mesons.