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