Left: cut-away representation of the SWA-PAS analyser head. The cut-plane is that containing the Sun-spacecraft line and the direction of elevation deflection. The yellow shading represents the direct solar light and the blue curves show the extreme ion trajectories in this plane. The instrument has partial cylindrical symmetry extending from +40° to −20° out of the plane of the figure. Right: the insert shows the top view of the CEMs array detector arrangement and its angular range.