We use a hydrodynamical model to describe the evolution of the collision system at collision energies s~(1/2) = 130 and 200 GeV. At lower s~(1/2) = 130 GeV energy we compare the results obtained assuming fast or slow thermalization (thermalization times τ_0 = 0.6 and 4.1 fm/c, respectively) and show that slow thermalization fails to reproduce the observed anisotropy of particle distribution. At s~(1/2) = 200 GeV collision energy our results show anisotropies similar to those observed at s~(1/2) = 130 GeV.
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