Fig. 4.

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Distinguished intensity profiles for spacetimes obtained from the initial conditions listed in Table 2 assuming the emission model (37). The left column shows the intensity for a Schwarzschild black hole with M = 10 (top row). This intensity profile is virtually indistinguishable from naked singularities of Type Ia, Type Ib, and Type III. The middle column gives the intensity for the Type Ic solution with initial conditions. The size of the shadow of a Schwarzschild black hole is added as a dashed line for reference. The presence of an inner turning point significantly enhances the intensity in the region btp2 ≤ b ≤ bcrit. Intensity profiles for Type II solutions illustrated in the right column do not exhibit a shadow; their image resembles that of a star with the peak intensity at small impact parameter b.
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