"Figures 4, 5, and 6" of "Combination of ATLAS and CMS searches for Higgs boson pair production at $\sqrt{s} = 13$ TeV"

Observed and expected negative log-likelihood ($-2\ ln\ \Lambda$) values as a function of the total signal strength parameter $\mu_{HH}$ for each of ATLAS, CMS, and their combination. All the other Higgs boson couplings are fixed to their SM predictions, but the overall ggF+VBF HH signal normalization is allowed to vary freely.