"Figure A3a" of "Search for low-mass vector and scalar resonances decaying into a quark-antiquark pair in proton-proton collisions at $\sqrt{s}$ = 13 TeV"

Upper limits at 95% CL on the visible cross section, $\sigma_{\text{vis}}$, defined as the number of signal events divided by the integrated luminosity, for the low-$p_{b\bar{b}}$ signal region. The solid line represents the observed limits, and the dashed line and the inner (green) and outer (yellow) bands represent the median and the regions containing 68% and 95%, respectively, of the distribution of expected limits under the background-only hypothesis.