Integrated number of single-pulse polarisation states projected onto a two-dimensional plane that is normal to the minor axis of the oblate spheroidal distribution observed at pulse longitude 0°. The greyscale intensity represents the count of instances in each pixel after integrating 1100 single pulses; contours are spaced at intervals of 5 counts. The angle between the Stokes V axis and the normal to the Q′−U′ plane is 7.2°.