"Fig. 4 left: Exclusion limit (ALP liniar EFT)" of "Measurement of dijet angular distributions and search for beyond the standard model physics in proton-proton collisions at $\sqrt{s}$ = 13 TeV"

The 95% CL upper limits on the ALP gluon coupling, $c_{g}$, as a function of the characteristic energy scale, $f_{a}$, assuming $m_{a}=1$ MeV. Only dijet angular distributions with $m_{jj}