"Figure 2, 27 GeV rapidity dependence" of "Measurement of the sixth-order cumulant of net-proton multiplicity distributions in Au+Au collisions at $\sqrt{s_{NN}}=$ 27, 54.4, and 200 GeV at RHIC"

Net-proton $C_{6}/C_{2}$ as a function of rapidity (left) and transverse momentum acceptance (right) from $\sqrt{s_{NN}}$ = 27 GeV (crosses), 54.4 (open squares), and 200 GeV (filled circles) Au+Au collisions. The upper and lower plots are for 0-10% and 30-40% centralities, respectively. The error bars are statistical and caps are systematic errors. Points for different beam energies are staggered horizontally to improve clarity. UrQMD transport model results are shown as shaded and hatched bands. The Skellam expectation ($C_{6}/C_{2} = 1) is shown as long-dashed lines.

本数据集展示了√s_{NN}=27 GeV（十字标记）、54.4 GeV（空心方块）与200 GeV（实心圆点）的金金（Au+Au）碰撞中，净质子（Net-proton）比值C₆/C₂随快度（rapidity）与横向动量接受度（transverse momentum acceptance）的变化关系，其中左图为随快度的变化，右图为随横向动量接受度的变化。上下两幅子图分别对应0-10%与30-40%的碰撞中心度。图中误差棒代表统计误差，误差帽代表系统误差。为提升图表清晰度，不同束流能量的数据点在水平方向上进行了错位排布。输运模型UrQMD的计算结果以阴影填充带与斜线填充带的形式呈现。斯凯朗（Skellam）期望值（C₆/C₂=1）以长虚线绘制。