Pion-kaon correlation functions and ratios of correlation functions. Errors are statistical only.

Pion-kaon correlation functions and ratios of correlation functions. Errors are statistical only.

Modeled pion-kaon correlation functions and ratios of correlation functions. Errors are statistical only from the calculations.

Modeled pion-kaon correlation functions and ratios of correlation functions. Errors are statistical only from the calculations.

The upper panel shows $v_{2}$ vs centrality using the conventional method, where the circles and triangles represent $v_{2}$ with and without $p_{t}$ weighting, respectively. The statistical error is smaller than the symbol size. The lower panel shows the statistical error on $v_{2}$ with $p_{t}$ weighting divided by the same without weighting.

The upper panel shows $v_{2}$ vs centrality using the conventional method, where the circles and triangles represent $v_{2}$ with and without $p_{t}$ weighting, respectively. The statistical error is smaller than the symbol size. The lower panel shows the statistical error on $v_{2}$ with $p_{t}$ weighting divided by the same without weighting.

The upper panel presents $v_{2}$ vs centrality from the scalar product method (triangles) and the conventional random subevent method (circles). All statistical errors are smaller than the symbol size. The statistical error for the scalar product method divided by that for the conventional method is shown in the lower panel.

The upper panel presents $v_{2}$ vs centrality from the scalar product method (triangles) and the conventional random subevent method (circles). All statistical errors are smaller than the symbol size. The statistical error for the scalar product method divided by that for the conventional method is shown in the lower panel.

Elliptic flow as determined from the fits to the $q$ distributions in different centrality bins. The circles are from the standard method with random subevents. For the squares, all the centralities were fit separately. For the triangles, centrality bins 2-8 were fit with the same value of the nonflow parameter.

Measured elliptic flow vs centrality for $Au+Au$ at $\sqrt{s_{NN}}=130$ GeV. The circles show the conventional $v_{2}$ with estimated systematic uncertainty due to nonflow [37], the stars show the fourth-order cumulant $v_{2}$ from the generating function, the crosses show the conventional $v_{2}$ from quarter events, and the squares show the fourth-order cumulant $v_{2}$ from the four-subevent method.

Reconstructed $v_{2}$ vs pseudorapidity from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant method (stars), in eight centrality bins. The upper left panel shows the most peripheral events, and the lower right the most central.

Reconstructed $v_{2}$ vs pseudorapidity from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant method (stars), in eight centrality bins. The upper left panel shows the most peripheral events, and the lower right the most central.

Reconstructed $v_{2}$ vs pseudorapidity from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant method (stars), in eight centrality bins. The upper left panel shows the most peripheral events, and the lower right the most central.

Reconstructed $v_{2}$ vs pseudorapidity from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant method (stars), in eight centrality bins. The upper left panel shows the most peripheral events, and the lower right the most central.

Reconstructed $v_{2}$ vs pseudorapidity from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant method (stars), in eight centrality bins. The upper left panel shows the most peripheral events, and the lower right the most central.

Reconstructed $v_{2}$ vs pseudorapidity from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant method (stars), in eight centrality bins. The upper left panel shows the most peripheral events, and the lower right the most central.

Reconstructed $v_{2}$ vs pseudorapidity from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant method (stars), in eight centrality bins. The upper left panel shows the most peripheral events, and the lower right the most central.

Reconstructed $v_{2}$ vs pseudorapidity from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant method (stars), in eight centrality bins. The upper left panel shows the most peripheral events, and the lower right the most central.

Reconstructed $v_{2}$ vs $p_{t}$ from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant method (stars), in eight centrality bins. The upper left panel shows the most peripheral events, and the lower right the most central.

Reconstructed $v_{2}$ vs $p_{t}$ from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant method (stars), in eight centrality bins. The upper left panel shows the most peripheral events, and the lower right the most central.

Reconstructed $v_{2}$ vs $p_{t}$ from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant method (stars), in eight centrality bins. The upper left panel shows the most peripheral events, and the lower right the most central.

Reconstructed $v_{2}$ vs $p_{t}$ from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant method (stars), in eight centrality bins. The upper left panel shows the most peripheral events, and the lower right the most central.

Reconstructed $v_{2}$ vs $p_{t}$ from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant method (stars), in eight centrality bins. The upper left panel shows the most peripheral events, and the lower right the most central.

Reconstructed $v_{2}$ vs $p_{t}$ from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant method (stars), in eight centrality bins. The upper left panel shows the most peripheral events, and the lower right the most central.

Reconstructed $v_{2}$ vs $p_{t}$ from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant method (stars), in eight centrality bins. The upper left panel shows the most peripheral events, and the lower right the most central.

Reconstructed $v_{2}$ vs $p_{t}$ from the conventional method (circles), from the second-order cumulant method (triangles), and from the fourth-order cumulant method (stars), in eight centrality bins. The upper left panel shows the most peripheral events, and the lower right the most central.

Elliptic flow vs pseudorapidity from the conventional method (circles), from the second-order cumulant method (triangles), from quarter events (crosses), and from the fourth-order cumulant method (stars), averaged over all centralities from bin 2-7, as defined in Figs. 14 and 15.

Elliptic flow vs transverse momentum from the conventional method (circles), from the second-order cumulant method (triangles), from quarter events (crosses), and from the fourth-order cumulant method (stars), averaged over all centralities from bin 2-7, as defined in Figs. 14 and 15.

The ratio of $v_{2}$ from the fourth-order cumulant divided by $v_{2}$, from the conventional method as a function of $p_{t}$, averaged over all centralities from bin 2-7, as defined in Figs. 14 and 15.

The ratio of $v_{2}$ from quarter events divided by the conventional $v_{2}$ as a function of $p_{t}$. In both cases, event planes were constructed from low-$p_{t}$ (< 0.5 GeV/c) particles. The data are averaged over all centralities from bin 2-7, as defined in Figs. 14 and 15.

$v_{2}/\varepsilon$ as a function of charged particle density in $Au+Au$ collisions. Data are from E877 at the AGS (squares), NA49 at the SPS (circles), and STAR at RHIC (stars). The AGS and SPS data have been obtained by conventional flow analysis. The STAR measurements are at $\sqrt{s_{NN}}=130$ GeV, and correspond to the final corrected elliptic flow based on fourth-order cumulants, and we assume $dN/dy=1.15dN/d\eta$. The horizontal shaded bands indicate the hydrodynamic limits for different beam energies [44].