Figure 4

Left: Examples of fits to $\Dzero$ (top), $\Dplus$ (middle) and $\Dstar$ (bottom) impact-parameter distributions in the $\pt$ intervals$3< \pt< 4 \gevc$, $5< \pt< 6 \gevc$ and $6< \pt< 8 \gevc$, respectively The curves show the fit functions describing the prompt, feed-down and background contributions, as well as their sum, as described in the text Right: fraction of prompt $\Dzero$ (top), $\Dplus$ (middle) and $\Dstar$ (bottom) raw yield as a function of $\pt$ compared to the FONLL-based approach The results from the data-driven method are shown as square markers with theerror bars (boxes) representing the statistical (systematic) uncertainty The arrow in the interval $1< \pt< 2 \gev/c$ represents the minimum value within a 95% confidence level The central values of $f_{\rm prompt}$ from the FONLL-based approach are shownby the dashed line and their uncertainty by the red boxes.