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Fig. 1.

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Second radial derivative of particle effective potential, V part $ V^{{''}}_{\mathrm {part}} $ (top row), and first radial derivative of the photon potential, V phot $ V^{\prime}_{\mathrm {phot}} $, both as a function of the radius, r, with β = 0 and varying α (left panels) and with α = 0 and varying β (right panels), at the equatorial plane θ = π 2 $ \theta =\frac {\pi }{2} $. The radius of the ISCO is defined as the radius at which V part = 0 $ V''_{\mathrm {part}} = 0 $, and the radius of the photon orbit is defined as the radius at which V phot = 0 $ V^{\prime}_{\mathrm {phot}} = 0 $. We observed that a change in α causes the radii of the ISCO and the photon orbit to change in the same direction, whereas a change in β causes these radii to change in opposite directions.

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