"Exclusion contour (obs) 2" of "Search for direct top squark pair production in final states with two leptons in $\sqrt{s} = 13$ TeV $pp$ collisions with the ATLAS detector"

Observed exclusion limits at 95% CL from the analysis of $36.1 \; \text{fb}^{-1}$ of 13 TeV $pp$ collision data as a function of the mass of the $\tilde{t}_1$ for a fixed $(\tilde{\chi}^0_1) = 0$ GeV, assuming $\text{BR}(\tilde{\chi}^0_2 \to Z\tilde{\chi}^0_1) = 0.5$ and $\text{BR}(\tilde{\chi}^0_2 \to h\tilde{\chi}^0_1) = 0.5$.