"Figure 6a Observed" of "Search for direct top squark pair production in events with a Higgs or $Z$ boson, and missing transverse momentum 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 masses of the $\tilde{t}_2$ and $\tilde{\chi}^0_1$, for a fixed $m(\tilde{t}_1)-m(\tilde{\chi}^0_1) = 180$ GeV and assuming a $\text{BR}(\tilde{t}_2 \to Z\tilde{t}_1) = 1$.