The \pt-differential $v_2\{4\}$ for \pipm{}, \kapm{}, and p+\pbar{} measured in Pb--Pb collisions at $\sqrt{s_{\mathrm{NN}}} = 5.02$ TeV compared with expectations of the same quantity from the CoLBT hydrodynamic model with quark coalescence . The left and right panels present the comparison for the 10--20\% and 40--50\% centrality intervals, respectively. The vertical error bars and the filled boxes represent statistical and systematic uncertainties of the data, respectively. The thickness of the model curves reflect the uncertainties of the hydrodynamic calculations.