a) $v_2(\pt)$ for the centrality bin 40-50% from the 2- and 4-particle cumulant methods for this measurement and for Au--Au collisions at $\snn = 200 $GeV b) $v_2${4}($\pt$) for various centralities compared to STAR measurements. The data points in the 20-30% centrality bin are shifted in $p_{\rm t}$ for visibility. |