Left: associated yield per trigger particle as a function of $\Delta \eta$ and $\Delta \varphi$ between inclusive muons with $ 2 < \pT < 2.5$~GeV/$c$ and SPD tracklets, $Y_{\rm sub}$, in high-multiplicity (0--20\%) p--Pb collisions at $\sNN =$~8.16 TeV after the subtraction of the unscaled (top) and scaled (bottom) muon--tracklet correlation in low-multiplicity (60--90\%) events. Right: fit of the corresponding correlation distributions in $-5 < \Delta\eta < -1.5$ projected onto $\Delta\varphi$ with a Fourier decomposition, see Eq.~(\ref{eq:fourier}). The three first harmonics are also presented.