Comparison between the effect of the event-shape selection obtained with the standard V0C and with the tuned TPC selections (see text for details), in the centrality class 30-40%. Top: $v_2\{\rm SP\}$, bottom: ratios to the unbiased sample. Only statistical uncertainties are plotted (systematic uncertainties are smaller than the markers). | ![](https://alice-publications.web.cern.ch/sites/default/files/papers/1799/v2ESE_F128_qtpc_relaxed_rejected-17557.png ) |