Ion flux vs. angle for the BPT-4000 Hall current thruster at steady-state conditions. Flux scans at 100-centimeter radius were measured with a retarding potential analyzer. A high degree of symmetry is evident about the thruster's physical centerline at 0 degrees. Within 35 degrees from centerline, the flux is predominantly fast ions. Beyond 35 degrees, the contributions from ion-neutral elastic scattering and from charge-exchange production of slow ions become more important, yielding the wings on the flux curves.