Two- and three-pion Gaussian fit parameters versus $\langle{N_{\rm ch}}\rangle$ in pp, p-Pb and Pb-Pb collision systems for low and high $\kT$ and $K_{\rm{T,3}}$ intervals. Top panels show the Gaussian radii $R^{\rm G}_{\rm inv}$ and $R^{\rm G}_{\rm inv,3}$ and bottom panels show the effective Gaussian intercept parameters $\lambda^{\rm G}_{\rm e}$ and $\lambda^{\rm G}_{\rm e,3}$. The systematic uncertainties are dominated by fit range variations and are shown by bounding/dashed lines and shaded boxes for two- and three-particle parameters, respectively. The dashed and dash-dotted lines represent the chaotic limits for $\lambda^{\rm G}_{\rm e}$ and $\lambda^{\rm G}_{\rm e,3}$, respectively. | ![](https://alice-publications.web.cern.ch/sites/default/files/papers/1056/Fig_ParamsGauss_K1-6858.png ) ![](https://alice-publications.web.cern.ch/sites/default/files/papers/1056/Fig_ParamsGauss_K2-6859.png ) |