Modelled O* intensities as a function of radial distance at various energies for both polarity cycles at a polar angle of 55°. The position of the TS is indicated by the vertical line. The grey lines correspond to only adiabatic heating occurring in the heliosheath (i.e. κ_P,0 = 0.0), while the black lines include Fermi II acceleration (i.e. κ_P,0 = 0.5). The vertical dashed line shows the approximate position (at r = 120 AU) where non-radial solar wind flow may begin to dominate.