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STAR results: Event-wise observables

Figure. The final-state momentum anisotropy v2 (elliptic flow) divided by the spatial anisotropy of the initial overlap (participant) zone. The almond-shaped participant zone is depicted in the upper part of the figure. The horizontal axis is a relative measure of centrality — for any given experiment, the most head-on collisions correspond to the rightmost point. Hydrodynamic models predict values at RHIC given by the lower shaded band.

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