Dependence of the structure function on spin and inclination for a fixed astrophysical prescription. The purple curves correspond to the Keplerian-like inoisy model with λ₀(r) = 2π/Ω_K(r) ray traced with AART, while the orange curve corresponds to the homogeneous case λ₀(r) = 10. The lighter-colored curves correspond to the ray tracing of only the direct image (n = 0). For the homogeneous case, we show the analytic photon ring contribution using τ ∼ 16.3 M and γ ∼ 0.9π, values obtained from theory for a = 0.0 and i = 17^∘. As we can see, varying the inclination and spin changes the morphology of the structure function. Curves are normalized as in Figure 3, i.e., to Sgr A* observed data, to highlight shape differences.