Unidentified charged particle $v_2$ for shape selected and unbiased events as a function of collision centrality. The event selection is based on $q_2$ determined in the V0C with the lowest (highest) value corresponding to 0--10\% (90--100\%) $q_2$. Points are slightly shifted along the horizontal axis for better visibility. Error bars (shaded boxes) represent the statistical (systematic) uncertainties.