Logarithm of the total flux as function of the wavelength of Mrk 231. The dark green line corresponds to the modeled SED of the binary SMBH system, with the light green dotted lines denoting the secondary SMBH (M_*, s = 4.5 × 10⁶ M_⊙) and the darker green dotted one is for the primary SMBH (M_*, p = 1.5 × 10⁸ M_⊙), following Yan et al. (2015). The light red line is for the host galaxy and the blue one is for the torus component. The dark red line is the total SED with the following set of parameters: M_*, p, M_*, s, θ_p, θ_s, α_p, α_s, p_p, p_s, a_BBH, f_r, s.