Related paper Event shape engineering for inclusive spectra and elliptic flow in Pb-Pb collisions at $\sqrt{s_\rm{NN}}=2.76$ TeV Ratio of $v_2\{\rm SP\}$ in the large-$q_2$ and small-$q_2$ samples to unbiased sample. Only statistical uncertainties are plotted (systematic uncertainties are smaller than the markers).[png] [pdf]