"Aux : Figure 6a" 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"

Upper limits on cross-sections (in fb) at 95% CL for $\tilde{t}_1$ pair production with $\tilde{t}_1 \to t \tilde{\chi}^0_2$ and $\tilde{\chi}^0_2 \to \tilde{\chi}^0_1 h$ with 50% BR and $\tilde{\chi}^0_2 \to \tilde{\chi}^0_1 Z$ with 50% BR