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Figure 9

Top panels: average of $\Dzero$ and $\Dplus$ $v_2$ as a function of $\pt$ for $\PbPb$ collisions at $\sqrtsNN=5.02~\TeV$ in the small-$\qVZEROA$, large-$\qVZEROA$ (see text for details) and unbiased samples, in the 10--30\% (left) and 30--50\% (right) centrality classes. The charged-particle $v_2$ obtained at the same energy, centrality classes and ESE samples are superimposed for comparison. Bottom panels: ratios of the measured $v_2$ in the ESE-selected classes to the one obtained from the unbiased sample.
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