Base model-predicted flux shown with a solid line, compensated for by R^−2.5. The slope is considerably shallower than oc R^−2.5; hence, the inclining trend after the compensation. The model-predicted flux in the case of e = 0.5; θ = 45°; rp = 10%; β = 0.5; γ = −1.3; ϵ = 1 is shown with the dashed line. Even these rather extreme assumptions do not suffice to explain the slope observed in the data.