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Energy and system-size dependence of two- and four-particle<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>v</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>measurements in heavy-ion collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msqrt><mml:msub><mml:mi>s</mml:mi><mml:mrow><mml:mi>N</mml:mi><mml:mi>N</mml:mi></mml:mrow></mml:msub></mml:msqrt><mml:mo>=</mml:mo><mml:mn>62.4</mml:mn></mml:mrow></mml:…
We present STAR measurements of azimuthal anisotropy by means of the two- and four-particle cumulants ${v}_{2}$ (${v}_{2}{2}$ and ${v}_{2}{4}$) for Au+Au and Cu+Cu collisions at center-of-mass energies $\sqrt{{s}_{{}_{NN}}}=62.4$ and 200 GeV. The difference between ${v}_{2}{{2}}^{2}$ and ${v}_{2}{{4}}^{2}$ is related to ${v}_{2}$ fluctuations (${\ensuremath{\sigma}}_{{v}_{2}}$) and nonflow $({\ensuremath{\delta}}_{2})$. We present an upper …