Left: reconstructed beam pattern of A 0535+26 or emission of one magnetic pole as a function θ, as seen by a distant observer. The beam pattern is shown in linear representation for Regions A (left panels) and E (right panels) for different energy ranges. Right: reconstructed beam pattern for Region A in polar representation, for the energy ranges 18.27−30.90 keV (solid line) and 59.07−99.85 keV (dashed line). θ = 0° means that the distant observer is looking down onto the magnetic pole, and θ = 180° means that the observer looks at the pole from the antipodal position.