$v_{n}(p_{\rm T})$ using two--particle cumulant method with $|\Delta\eta|>$ 1 for (a) 0-5% and (b) 30-40% centrality classes; (c) $v_{2}(p_{\rm T})$ using four-particle cumulant method for the centrality 10-20%, 20-30% and 30-40%. Measurements for Pb-Pb collisions at $\sqrt{s_{_{\rm NN}}}=$ 2.76 TeV are also presented as shading. (d) The ratio of $v_{2}\{4\}$ in 20-30% from two collision energies is also shown here. The statistical and systematical uncertainties are summed in quadrature (the systematic uncertainty is smaller than the statistical uncertainty, which is typically within 5%). | |