Elliptic flow results are presented for Au + Au collisions at S_(NN)~(1/2) = 130 GeV in RHIC. This signal is investigated as a function of transverse momentum, rapidity and centrality. Results from four-particle correlation analysis, which can filter out contributions to the flow signal from correlations unrelated to the event reaction plane ("non-flow"), are presented and compared to the conventional method, in which non-flow effects are treated as part of the systematic uncertainty.
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