Ratio of two-particle results with a medium-sized pseudorapidity separation and 4-particle results to the two-particle results employing a large pseudorapidity separation between particles of interest and reference particles in Pb-Pb collisions at $\sNN{} = 5.02\,\TeV{}$. Also shown are the same ratios for the AMPT and CLVisc models. For the latter, the ratios are compatible with unity as the CLVisc model produces negligible non-flow .