Inclusive muon $v_2^{\rm \mu}$ as a function of $\pT$ at forward (left) and backward (right) rapidities in high-multiplicity p--Pb collisions at $\sNN =$ 8.16 TeV. The event activity is estimated with the V0M estimator. Open and full symbols refer to the measurements with two-particle correlations and two-particle cumulants, respectively.