Figure 4

Number of clusters used in the $\dedx$ calculation for $\pt>2 \gevc$ without (squares) and with (circles) the geometric cut. Results are presented for pp (upper panel) and central $\pbpb$ (lower panel) collisions at $\sqrt{s_{\rm NN}}=$ 2.76 TeV. The minimum number of clusters on a track is 70.
[png]   [pdf]   [eps]