The $p_{\rm{T}}$-differential ${v}_2$ for $\pi^{\pm}$, p+$\overline{\mathrm{p}}$, and $\Lambda$+$\overline{\mathrm{\Lambda}}$ in (a) measured with the scalar product method with a minimum pseudorapidity gap $|\Delta\eta| > 0.9$ for the 40-50$\%$ centrality interval of Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}} = 2.76$ TeV, compared to theoretical, hydrodynamical calculations coupled to a hadronic cascade model . Panel (b) shows the dependence of the ratio of the experimental points to a fit over the theoretical calculations as a function of $p_{\rm{T}}$.