"Aux Figure 04b-4" of "Search for nonresonant pair production of Higgs bosons in the $b\bar{b}b\bar{b}$ final state in $pp$ collisions at $\sqrt{s}= 13$ TeV with the ATLAS detector"

Distributions of the reconstructed m_HH in data (shown by the black points) and the estimated background (shown by the yellow histograms), in each of the six |Δη_HH|/X_HH categories in the ggF signal region, for the 2017 data.
The hatching shows the total uncertainty on the background estimate.
The distribution of the expected background is obtained using the best-fit values of the nuisance parameters in the background-only fit to the data.
Distributions of the SM and κ_λ= 6 signal models are overlaid, scaled so as to be visible on the plot, and the scaling for each signal model is the same across the six categories.
The lower panels show the ratio of the observed data yield to the predicted background in each bin.
Events in the underflow and overflow bins are counted in the yields of the initial and final bins respectively.
In the HEPData entry, the raw value per histogram bin is provided, while in the published paper the values in the histogram are scaled by the bin width.

2017年数据中，ggF信号区域内六个|Δη_HH|/X_HH类别各自的重建m_HH分布——数据以黑点表示，估计本底以黄色直方图表示。
阴影部分显示本底估计的总不确定性。
预期本底的分布通过仅本底拟合数据时得到的扰动参数（nuisance parameters）的最佳拟合值获得。
标准模型（SM）和κ_λ=6信号模型的分布被叠加，经缩放以在图中可见，且每个信号模型的缩放比例在六个类别中保持一致。
下方面板显示每个bin中观测数据产额与预测本底的比值。
下溢和上溢bin中的事件分别计入初始bin和最终bin的产额中。
在HEPData条目里，提供了每个直方图bin的原始值，而在发表的论文中，直方图中的值按bin宽度进行了缩放。