"Figure 4a Z($ee$) CR merged $U \in [250, 350] GeV$ bin" of "Search for dark matter produced in association with a Higgs boson decaying to bottom quarks in proton-proton collisions at $\sqrt{s}$ = 13 TeV"

The AK8 jet soft-drop mass distributions after the simultaneous likelihood background-only fit for $U$ in 250-350 GeV window, for the merged-category Z($ee$) CR. The black markers with statistical uncertainty bars show the observed data, the stacked colored histograms show the predicted background, and the gray shading shows the systematic uncertainty in the prediction. The lower panels show the ratios of the observed data to the background predicted before (pre-fit in red) and after (post-fit in black) the fit, with the gray bands indicating the post-fit uncertainty obtained from combining all statistical and systematic sources.