"Extended Figure 8e" of "Observation of Global Spin Alignment of $\phi$ and $K^{*0}$ Vector Mesons in Nuclear Collisions"

$\rho_{00}$ as a function of centrality for $\phi$ (upper panels) and $K^{*0}$ (lower panels). The solid squares and stars are results for the $\phi$ meson, obtained with the 1st- and 2nd-order EP, respectively. The solid circles are results for the $K^{*0}$ meson, obtained with the 2nd-order EP.}

$
ho_{00}$ 作为碰撞中心度的函数，分别对应$phi$介子（上图）与$K^{*0}$介子（下图）。其中实心方块与星号标记分别为采用一阶事件平面（Event Plane，EP）与二阶事件平面得到的$phi$介子结果；实心圆点为采用二阶事件平面得到的$K^{*0}$介子结果。