Non-prompt ${\rm J}/\psi$ fraction as a function of the relative charged-particle multiplicity at central rapidity for $\pt >1.3 \mathrm{GeV}/c$ The vertical bars represent the statistical uncertainties, while the empty boxes stand for the systematic uncertainties. The width and the height of these empty boxes indicate the measurement uncertainty on the horizontal and vertical axis respectively The dashed line shows the value of $f_{\rm B}$ measured in the same $\pt$ range and integrated over multiplicity . The shaded area represents the statistical and systematic uncertainties on the multiplicity-integrated result added in quadrature