Slope of $\RPO$ at low $\pT$ (in $0.4< \pT< 1.2$ \gevc) and at high $\pT$ (in $8< \pT< 20$ \gevc) versus centrality percentile in \PbPb\ collisions at $\snn=5.02$ TeV Vertical error bars denote statistical uncertainties, while the boxes denote the systematic uncertainties.