Related paper Harmonic decomposition of two-particle angular correlations in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV Examples of two-particle correlation functions $C({\Delta\eta}, {\Delta\phi})$ for central Pb-Pb collisions at low to intermediate transverse momentum (left) and at higher $\pt$ (right). Note the large difference in vertical scale between panels.[png] [eps][png] [eps]