Evolution of the Paα emission line (upper subplots) and corresponding differential phase (Δϕ, lower subplots) as a function of the wavelength for different values of clouds’ orbital parameters in the different models of single SMBH. Common parameters for all models: (a) and (b) clouds’ orbital inclination i_c ∈ [ − 5° ,5° ], clouds’ orbital eccentricity e_c = 0.5 and i₀ = 45°. (c) Clouds’ orbital inclination i_c = 𝒰(−7.5° ,7.5° ),  and i₀ = 𝒰(10° ,45° ). Varying parameters are given in subcaptions. Here, ℑ = 𝒰(l, r) stands for collection of inclination ranges from 𝒰(−l, l) up to 𝒰(−r, r). For reference, interferometric observables marked with blue colour were modelled for values at the lower end of the parameters ranges. (a) Ω_c ∈ 𝒰(10° ,180° ), ω_c = 110°, (b) Ω_c = 100°, ω_c = 𝒰(10° ,180° ), (c) ω_c = 200°.