Widths of $\RtwoCD(\Dphi)$ (blue markers) and $\PtwoCD(\Dphi)$ (red markers) correlation functions along $\Dphi$measured within $|\Deta| 1.6$ for pp and within $|\Deta| 1.8$for p--Pb and Pb--Pb collisions  as a function of$\dnavg$. Vertical bars and boxes represent statistical and systematic uncertainties, respectively.