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Figure 1

Top panels: Invariant mass distribution of opposite-sign pairs from the same event and mixed events for the $0$--$10$\% (left) and $60$--$90$\% (right) centrality classes in \PbPb collisions at $\snn = 5.02$~TeV. Bottom panels: Background-subtracted invariant mass distributions in comparison with the expected Monte Carlo signal shape.
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[png]   [pdf]   [eps]