"Figure 16" of "Combination of ATLAS and CMS searches for Higgs boson pair production at $\sqrt{s} = 13$ TeV"

Expected and observed 95% CL upper limits on the total HH cross section, defined as the sum of the ggF and VBF HH SM production cross sections, for ATLAS, CMS, and the combination from both experiments. The expected limits on $\mu_{HH}$ are obtained assuming the absence of an HH signal $(\mu_{HH}^{Asimov}=0)$. The theoretical prediction is indicated in red.