Amplitudes of the relative radii oscillations $R^{2}_{\rm out,3}/R^{2}_{\rm side,0}$, $R^{2}_{\rm side,3}/R^{2}_{\rm side,0}$, and $R^{2}_{\rm os,2}/R^{2}_{\rm side,0}$ versus centrality for four $\kt$ ranges. Square brackets indicate systematic uncertainties. The shaded bands are the 3+1D hydrodynamical calculations  and the width of the bands represent the uncertainties in the model calculations