Distributions as a function of $\Delta\varphi$ for $R=0.2$. Upper panels: $\Delta_{\rm recoil}(\Delta\varphi)$ in intervals of $p_{\rm T,\text{ch jet}}$ measured in pp and Pb$-$Pb collisions. Lower panels: $I_{\rm AA}(\Delta\varphi)$, the ratio of the pp and Pb$-$Pb distributions in the corresponding upper panel. Predictions from JETSCAPE, JEWEL, Hybrid model, and a pQCD calculation are also shown.