Results for $R_{2}(\eta^{\rm a}, \eta^{\rm b})$ in p--Pb collisions at $\snn$ = 5.02 TeV as a function of $|\eta^{\rm a}|$ (red squares). Statistical (systematic) uncertainties are represented by vertical bars (filled boxes). Calculations from AMPT with string melting and 3DGlauber+MUSIC+UrQMD are shown as filled shadows and solid lines.