Fig. 3
A set of geodesics of massive particles orbit around a black hole with a = 0.9. The physical velocities of the emitter with respect to the LNRF are υr = 0, υθ = 0, and υφ = 0.4, υφ = 0.5, υφ = 0.6, υφ = 0.7, υφ = 0.8, υφ = 0.9 for panels from left to right, top to bottom. The velocities of these particles are specified isotropically in the rest frame of the emitter and 
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