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Elliptic flow
Initial anisotropy in x-space in non-central collisions (overlap) translates into final azimuthal asymmetry in p-space (transverse to react. plane)
1. Truly collective effect (absent in p+p collisions).
2. Early-state phenomenon:
develops only in 1st instants of reaction,
strongly self-quenches after t~2 fm/c