The ratio $v_2\{{\rm 2PC}\}/v_2[{\rm 2PC}]$ in p--Pb collisions at $\snn$ = 5.02 TeV as a function of transverse momentum, for 0--20\% V0A (red points), 20--40\% V0A (blue points) and 40--60\% V0A (green points) (top panel). The ratio with respect to the measurements in 0--20\% V0A is also presented (bottom panel). Statistical (systematic) uncertainties are represented by vertical bars (filled boxes). Calculations from AMPT with string melting and 3DGlauber+MUSIC+UrQMD are shown as textured and plain bands, respectively. The ratio results from AMPT are not shown in the bottom panel due to excessively large statistical uncertainties.