The distributions of \rg in \pp and \PbPb collisions at \fivenn for jets with $60 \leq $ \ptjetch $ 80$ \GeVc for selections of small and large \zg. The left panel shows the \rg distribution for $0.2 \leq \zg 0.35$, and the right panel shows \rg for $0.35 \leq \zg 0.5$. The bottom panels show the ratio of the measurement in \PbPb collisions to the measurement in \pp collisions.