"Figure 3.4" of "Elliptic flow of charged particles at midrapidity relative to the spectator plane in Pb-Pb and Xe-Xe collisions"

Slopes of the Linear fits to the transverse momentum dependence of $v_2\{\Psi_{\mathrm{SP}}\}/v_2\{4\}$ for different centrality classes in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76~\mathrm{TeV}$.在√s_NN=2.76 TeV的铅-铅（Pb-Pb）碰撞中，针对不同中心度区间的$v_2{Psi_{mathrm{SP}}}/v_2{4}$的横向动量（transverse momentum）依赖关系所进行的线性拟合（linear fits）的斜率。