(a) 3D representation of most likely emission beams during BP1, BP2, the IP, and the WP, derived from this work, shown at the minimum approach of the magnetic axis () to the LOS (). The figure shows three viewing configurations, corresponding to three geodetic-precession phases, at MJD53000, MJD53750, and MJD54500. The trace of the LOS is shown with a white line. The colour scale represents the beam intensity in arbitrary units, normalised between 0 (blue) and 1(red), in steps of 0.1.