Figure 1

Distributions of the invariant mass for $\Dzero$ (left column) and $\Dplus$ (middle column) candidates and of the mass difference for $\Dstar$ candidates (right column) in two centrality classes defined with the ZNA estimator: 0-20% and 60-100%. The red lines in each plot represent the fit to the background, and the blue lines represent the sum of signal and background. One $\pt$ interval is shown for each meson species: $2< \pt< 4$ GeV/$c$ for $\Dzero$, $4< \pt< 6$ GeV/$c$ for $\Dplus$, and $6< \pt< 8$ GeV/$c$ for $\Dstar$.
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