Pearson correlation between the measured \pbar and \dbar as a function of collision centrality in Pb--Pb collisions at \snn$ = $5.02 TeV. Bars and boxes represent statistical and systematic uncertainties, respectively. Measured correlations are compared with estimations from the CE version of the SHM for two different baryon number conservation volumes, from coalescence model and from MUSIC+UrQMD+COAL.