Photometric quantities extracted from τ_dyn = 1, ϵ_n = 0.1 simulations, performed for various values of r_h. The simulations marked with black symbols, for r_h ≥ 0.61 are the same simulations as displayed in Fig. 7 of Mondino-Llermanos & Salo (2023), with the calculation size of 5λ_cr × 10λ_cr. The red symbols indicate simulations with r_h < 0.61: to have a better statistics in photometric calculations, the simulated region does not scale with λ_cr but has a fixed size of 350 × 175 particle radii (this corresponds to 5λ_cr × 10λ_cr at r_h = 0.61). The upper row shows quantities related to the azimuthal I/F profiles: the minimum and maximum brightness, the amplitude A_asym defined in Eq. (19) and ∆θ_min, the longitude of I/F minima wrt to ansae. In the case of self-gravity wakes, their pitch angle ϕ_w = −∆θ_min. In the middle upper panel, the dashed curve corresponds to Lambert-phase function with ϖ = 0.7; in other cases Callisto phase function with ϖ = 0.4 is assumed. The lower row displays similar quantities derived from the optical depth profiles. Light shading (r_h = 0.5–0.6) indicates the regime where overstability emerges and grows in amplitude, while the dark shading marks the regime where wakes suppress overstability (r_h > 0.65).