Nuclear modification factor $\RpPb$ of electrons from heavy-flavour hadron decays as a function of transverse momentum for minimum-bias p-Pb collisions at $\snn$ = 5.02 TeV, compared with theoretical models, as described in the text. The vertical bars represent the statistical uncertainties, and the boxes indicate the systematic uncertainties. The systematic uncertainty from the normalisation, common to all points, is shown as a filled box at high $\pt$