"Figure 4" of "A search for microscopic black holes, string balls, and sphalerons in proton-proton collisions at $\sqrt{s}$ = 13 TeV"

The $S_T$ distribution in the SI-VR in data, indicated by the black markers. The background prediction is represented by the red line, and the gray band corresponds to the background modeling uncertainty.

The background prediction is obtained from a fit using the functional form $f(S_T) = \frac{p_0 \left( 1 - (S_T')^{1/3} \right)^{p_1}}{(S_T')^{p_2 + p_3 \ln(S_T')}}$.