Fig. 1
Snapshots of the motion of a hotspot formed near the ISCO of a black hole with a spin a = 0.5rg (left panels) and a naked singularity with a spin a = 2rg (right panels), both observed at an inclination of i = 75° at four different phases φ. The colour bar indicates the observed flux in arbitrary units. The impact parameters α and β are expressed in gravitational radii.
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