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

Exclusion limit at the 95% confidence level on the total HH cross section as a function of the value of $\kappa_\lambda$. The expected exclusion is computed assuming no HH signal is present $(\mu_{HH}^{Asimov}=0)$. The individual results by ATLAS and CMS are indicated by the green and purple lines, respectively. Dashed and solid lines denote respectively the expected median and the observed limits. The theoretical prediction, corresponding to the sum of the ggF and VBF HH cross sections, is shown in red.