The analysis of anisotropic flow of particles created in high energy heavy-ion collisions gives insight into the early stage of these reactions. Measurements of directed flow (vi), elliptic flow (v%) and flow of 4th and 6th order (V4 and VQ) aie presented. While the study of V2 for multi-strange particles establishes partonic collectivity the results for higher order anisotropies constrain the initial conditions of hydro-dynamic model calculations.
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