3D $R$ and $\lambda$ parameters as a function of $k_{\rm T}$ in three multiplicity and two $k_{\rm T}$ classes. The experimental data (markers) are compared with the EPOS 3 model predictions shown by bands, the width of which represents the statistical uncertainty on the model calculations. Statistical (bars) and systematic (rectangles) uncertainties are shown. Points are shifted with respect to the 0$-$20% multiplicity class along the $x$ axis for clarity.