Figure. The final-state momentum anisotropy v2
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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