Minkowski evolution of the angle θ_B (angle between magnetic field and emission direction in the emitter’s frame) for r₀ = 8M. The various colors encode various inclinations ι between 0° (face-on, dark blue) and 90° (edge-on, light blue), with a 10° step. The synchrotron emission is suppressed at θ_B = 0[π], so we concluded that the orbital phase φ = π (corresponding to the left part of the image, i.e., toward the east direction) is strongly suppressed around ι = ι₀ ≈ 20°. We emphasize that this angle ι₀ depends on the orbital radius, and here r₀ = 8M.