Notes. The following values reproduce the scattering screen at a reference wavelength of λ₀ ≡ 1 cm. The sizes along the major and minor axes of the anisotropic Gaussian (θ_maj, 0, θ_min, 0), position angle (PA_G), screen-Sgr A* distance (R_scat), screen-observer distance (D_scat), inner scale (r_in) for the power spectrum of the electron-density fluctuations in the screen, and the index (α) of the power law for that power spectrum produced by turbulence as given by Johnson et al. (2018). The scattering screen geometry is shown in Fig. 3.