Top panel: overview of the spectrum of the adiabatic benchmark equilibrium with both azimuthal and axial flow is shown. Insets zooming in on the continua are added. Middle left panel: zoom-in image of the upper edge of the forward-propagating Alfvén continuum. Three discrete Alfvén modes are marked. The corresponding eigenfunctions are shown in the middle right panel. Bottom left panel: forward-propagating Alfvén continuum as a function of radius for the adiabatic benchmark equilibrium, for the static version of the benchmark equilibrium, and for a version of the benchmark equilibrium with only axial flow. The backward-propagating Alfvén continuum is shown in the bottom right panel.