Non-prompt ${\rm J}/\psi$ relative yield as a function of the relative charged-particle multiplicity at central rapidity for $\pt>0$ The systematic uncertainties on the data normalisation (+6% / -3%) and on the $({\rm d}N_{\rm ch}/{\rm d}\eta) \big/ \langle {\rm d}N_{\rm ch}/{\rm d}\eta \rangle$ values ($\pm6%$) are not shown in this figure PYTHIA 8.157 calculation for B mesons is also presented The coloured line represents the calculation curve, whereas the shaded band represents its uncertainty at given values of $({\rm d}N_{\rm ch}/{\rm d}\eta) \big/ \langle {\rm d}N_{\rm ch}/{\rm d}\eta \rangle$ The diagonal (dashed) line is shown to guide the eye