  Elliptic flow results are presented for Au + Au collisions at $\sqrt{s_{NN}}
= 130$
  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.
