"Figure 1 (left)" of "Search for a new heavy resonance decaying to a top quark and a neutral scalar boson in proton-proton collisions at $\sqrt{s}$ = 13 TeV"

Postfit distributions of data and predicted background in the SR under the background-only hypothesis, projected onto the $\mathit{m}_{\phi}^{\text{rec}}$ axis of the $\mathrm{T}_{\mathrm{Xbb}}$ Pass tagging region, $\mathrm{SR}_{\mathrm{P}}$. A $\mathit{m}_{\phi} = 175$ GeV, $\mathit{m}_{\mathrm{T}^{\prime}} = 1100$ GeV signal sample normalized to a cross section of 220 fb is overlaid for visualization. The $y$ axes of the top panels have been rescaled to display the number of events per bin, divided by the width of each bin. The lower panels show the pull distributions, defined for each bin as the difference between the observed data and the postfit background prediction divided by the square root of the difference between the squared Poisson uncertainty in the data and the squared postfit uncertainty in the total background estimate in that particular bin. The full yields in each bin are presented here without division by the bin width as shown in the paper.